Troubleshooting A Victa Lawn Mower

Troubleshoot Your Victa Lawn Mower Issues

Tools/Parts Required.

  • Spare Fuel Line
  • Spark Plug Socket
  • Spark Plug

Step 1.

The first thing to check is whether the lawn mower has a spark – click here if unsure how to do that. If there isn’t a spark, replace the spark plug and.see if that solves the problem.

Step 2

If there is a spark but the mower won’t start place a small amount of petrol into the hole which the spark plug screws into – usually easiest to siphon petrol from the mower using a small tube. Then tighten the spark plug in place and attempt to start the mower. If the mower starts but doesn’t continue to run, then the problem is most likely the carburetor, as it is not allowing petrol to flow through it. If the mower starts and continues to run then the carburetor is fine.

Step 3

If you determined the problem to be the carburetor then open it up and give it a service – click here for assistance. Things to pay particular attention to in the carburetor are: green/off petrol, main jet being blocked, position of the float (whether the needle is too worn), and the diaphragm – these will all need a good clean.

Step 4

Another common problem to watch out for is the throttle cable not working properly, this may be a cause for the mower not starting, and can also cause it not to turn off – click here for assistance on this topic.


  1. I have a victa tornado mower. Recently it will not rev at the operating speed required, but will work on a semi idle basis. It will it consistently run with it nearly dying if I don’t tamper with the accelerator.

    I replaced the plug, diagram, accelerator cable, and float and needle. I also put in a new air filter.

    So I’m thinking that the fuel and air is ok and when I test the plug it has spark but I can’t tell if it’s consistent enough.

    The only other thing that I can think of is a blocked exhaust. It seems to run better when cold and then farts around when operating temp is gained, and probably gets worse.

    It tried to rev but cannot get there without farting and nearly stalling before I muck around again with the accelerator.

    What do you think the problem is?

    • If the Carburetor is clean and you cannot find any air leaks in the Tubing or Oil Seals, the first thing i would look at would be the Decompressor and the Vacuum Point on the Block of the engine, if the Vacuum line on top of the carburetor is malfunctioning it can cause those symptoms.

      • Decomperssion on mine seems to be part of the auto prime fuel system mine wont run either looks like my stepsons fked with it do you know where i can find some blueprints or tips on troubleshooting this setup? Looks like theres some sort of swich on the muffler box between exaust outlet appears to do nothing whats this for?

        • Hi

          we could provide some advice if you send some images through to “”


      • I followed the carb float checking as mine was hard to start and would not run properly,whilst in parts I noticed the compression valve sensor unit was filthy also that the hose was loose, I removed it and cleaned it in petrol blowing air through the line showed a serious leak I then cut the offending peice of tube off (about 1.5 cm ) and used some hot water to soften the tube before pushing it back on. Reassembly proved where the answer lay. MarkinNam

  2. Hi, unfortunately you missed a step, you talk about being a spark, what about when there is no spark even after you have purchased a new spark plug ?

  3. Hi,
    I replaced the spark plug and make sure there is spark ,did the step 2 by place small amount of petrel into the spark plug hole, but still can’t start the engine.

    Any suggestion?


    • Hi

      if you cannot get it to start with some petrol placed in the spark plug hole the next step is to do a compression test to determine if the piston and rings need to be replaced

      • Whilst Bobbie’s is an old post but I thought I would add my experience with the same problem with a 125cc 70 series. My mower would start readily but no revs. Carby (G3) would open fully with the cable throttle lever. Mower did sound like it was 4 stroking. The compresion was good (first pull 60, second 75 third 90 and remained at 90 thereafter).
        I removed muffler and looked into the bore but found that the exhaust port was almost completly blocked with carbon near the cylinder wall except for a 3mm diameter hole. Carbon was quite hard and I had to chip it away (with the piston up so that no hard carbon would enter the bore). Re-assembled mower and now runs well.

    • Gday
      Don’t suppose you have a wiring diagram for a victa silver streak.
      Bloody mower caught fire it’s ok but fried the ignition wiring.Not sure how the wires go from the CDI ,earth,coil,carb

  4. Hi,

    This site is an excellent source of information. However, I cannot find any solution as to what steps can be taken when the throttle cable in the carby keeps detaching from the attachment on the carby itself … do I need to buy a new throttle body, or is there a simple fix with two rivets and some mild steel or aluminium?

    Thoughts and suggestions would be much appreciated.

    • Hi Justin

      We have not devised any makeshift solutions for this problem at the moment a small piece of metal and some rivets could possibly work otherwise the throttle body would need to be replaced

    • Hi Justin,

      Depending on how the carb is damaged, you may be able to repair using a couple of cable ties and something that moulds like rubber or a piece of rubber shielded cable/wire.

      My cable would lift out of the guide and away from the carb.

      Feed the throttle cable into the carb, and clip the metal stop into the guide on the end of the carb.

      Place the rubber on the outside of the carb where the throttle cable feeds in and clips into the carb.

      Using the cable ties, strap the rubber down so that it presses the throttle cable into the guide.

      I hope this makes sense, and helps you solve your problem.

  5. Hi Justin

    Last week I changed the blades and the spark plug on my Victa. When I fired it up, it started fine, but it wouldn’t turn off. I had to disconnect the cable from the spark plug to stop the engine. Any suggestions please?

    • It sounds like your mower has some serious problems I will need much more detailed information if you want any troubleshooting advice.

  6. I have victa 2 stroke that I had going ,then hadn’t started it for some time resulting in not starting just rebuilt the carby has good spark have cleaned vacuum lines cleaned fuel tank,tap and fuel line fresh fuel do you fellas have any ideas

    • If you have good spark and fuel at the spark plug the first thing I would check would be the compression of the lawn mower this is the most common issue if fuel and spark are present and the mower will not start.

  7. Hi, I have just purchased a second-hand Victa 505 160cc self propelled mower, it works fine to begin but then when I stop, the fuel constantly pours out through the rubber primer button, Any ideas?

    • Hi Ian

      That means that there is too much petrol getting into the carby, You will need to remove the primer cap and inspect the float and needle.

  8. I have a Victa Commando which recently started surging at top speed, revs would increase then decrease until it finally stalled. I replaced top and bottom seals and the seal on the carby spigot and overhauled the G4 carby and yet the problem still remains. Any clues on what this might be. Keep in mind that it runs on low speed with only light surging but will keep running and it gets worse as it warms up. Any help will be much appreciated. Thank you.

    • Surging is more often caused by changes to the air fuel mix either by blockages in the carburettor or leaks in the intake, If both of those items seem in working order I would next look at the compression of the engine and the condition of the ignition system.

  9. I purchased one of your kits to rebuild the carby and have since got it to run. I can only get the mower to rev when I remove the breather line. Any thoughts?

    • Hi Ben

      The breather line controls the Rpm limit on these engines, The port of the engine block may be blocked completely causing the mower to not be able to rev as it should

  10. Thanks Lachlan, I can blow through the line into the block with little restriction. The revs increase when i throttle up, just not enough to cut the lawn.

    • Hi Ben

      It sounds like the mower is running a little rich, If you removed the breather hose and the revs increase. I would suggest checking the air filter and the intake hose for any restrictions.

  11. Victa 80 160cc series run fine for 34 years until now…
    Mower starts and runs fine at mid throttle but will not rev and torque up enough to throw grass to the back of the catcher!
    New plug , airfilter and new fuel mix but the intake sound only growls louder with throttle on with no increase in revs!
    Secondly I can get it to slowly increase revs to full speed by pulling air hose off and then it runs fast. Cleaned carb and tank, blew out tubes.
    Have not checked vacuum area and muffler for bolckage as it does run fast with no filter attached. It’s not the filter as I have replaced it 3 times thinking it was it. How do you adjust fuel mix on the plastic carbs? Any suggestions apart from engine rebuild welcome.

    • Hi

      There is two main causes for this issue, A rich fuel mix caused by too little air or too much fuel getting into the engine. The only way to troubleshoot this is to thoroughly clean and check the carburetor for worn parts, Or a lack of compression reducing the power of the engine and its ability to rev, Being 34 Years old it is quite possible that is the case.

  12. Hi I have a late 70s full crank victa that starts and runs fine but is horrendous to get going again I also started it and shut it straight off to see if it was an issue to do with a hot engine and found it was the same hot or cold could this be compression ? Also I was thinking about taking the self propelled axle off my 550 mulcher and fitting it to my 505 push catcher would it fit or are there small differences? And short of finding a set of so handles I’d have to try drilling the holes for the so lever and lover cable bracket tensioner . any help would be great

    • Hi Karl

      It is unlikely to be compression as that should get better after running the engine, I would try turning the fuel tap off when the mower is running and waiting for that to cause it to shut down, Then turn the fuel back on and try restarting. Sometimes Victa mowers flood when they are turned off and become hard to start, I have not seen it done but with the similarities between the two models I sure it would be possible, Although as you expect I’m sure holes will need to be drilled.

  13. Thanx Lachlan I will see if it starts after turning fuel off and on I’ve used it a few times after refurbishing the carby and performs fine so was surprised when it would not start we’ll I say would not it did eventually long time later I also found if I leave for 10 it will fire straight up always fuel and spark present tho a little weak so I checked the electronic ignition module and found it to be around 6.7 ohm which I thought is verry high swapped it for a smaller later type hoping it would cure it but no .only other thing about this early full crank 160 engine is parts unless I’m wrong are they hard to find like piston rings where would I find the part number for them I took a goes which was wrong and when they arrived they were every small lol we’ll after trying this next step compression test I think . and hopefully the alxe will fit on to the 505 just leaving the tricky job of drilling the 3 holes for the tensioner bracket and lever on the handles if I can’t source some so handles . tho at this point I’ve just refurbished another 550 mucher and thought I’d test it other day all OK tick over nice low with one brass washer on poppet valve throttles up fine tho thought at first revs were a little high but after about a second revs fall slightly so the governor pipe from flywheel vacume point to diagram must be working so all was fine until abit of throttling up and down later and now I seem to have the opposite of your engines Paul and Berty now it revs to a moderate 2000 and will not tick over engine shuts down as did think cable had popped out also checked diagram had not been sucked in from around the edge on car by sorry to waffle on lol

  14. Ok, 80 series full crank 160; pulled carby and cleaned it and get a good start and idle. But stull won’t rev up to grass cutting speed!
    I believe it’s a carbon blocked muffler… How do I pull the muffler off to clean it out???

    • On those older models the muffler is held on with some bolts that also hold the top cowling on, Once the cowling is removed there are two clips that secure the exhaust these can be pried of with a flat head screwdriver. Once these clips are remove the exhaust should be free.

  15. Managed to sort the half revving and non tick over problem was the outer sheif of the throttle cable coming away from the worn grips on carby so all is OK with that one apart from little bit of oil that collects on the bottom head bolt its had new gasket and have re torqued bolts after hot its no major problem just strange lol I have to laugh at the speed of these mowers

    • Hi Lawrence

      It is mostly likely to be a problem with the carburetor causing not enough fuel to flow one the most has started.

  16. I have a strange issue with my Victa (not sure what model, but it is an old green one with a G4 carby) that I can’t seem to find any info on – be interested if you have come across it. I had to service my carby because the primer bulb was leaky. I did that and since putting it all back together it starts perfect – and will run ok if the throttle is left in the one position. However if I try to increase the revs the mower will stall, but if I try to decrease the revs, the mower will actually increase revs.. ? Its almost doing the opposite of what the throttle cable should do. Would be very interested to hear if you have come across this before !

    • Hi Mike

      I have not come across that particular issue before it sounds quite unique. If you send me a picture via the contact page I may be able to narrow down your model for you. It could be that the mower is running a little bit lean meaning too much air or too little fuel is making it into the engine, this could cause the symptoms you describe, You can test this by clamping the intake hose while the mower is running to reduce airflow and then observing how the engine responds.

      • Good idea – will give that a go tonight and see what it does. I’ll take a picture and send it thru tonight/tomorrow as I will be interested to see what model it is.

        Most people tell me to give up on this mower but I reckon it cuts better than most mowers I’ve owned !

        Cheers !

  17. We’ll found out the so 550 pro mulcher axle is an inch shorter than the 505 catcher and the hole for the height adjustment bar link is in a diff place . but anyways cant go with the I dear of removing the gearbox and axles and fitting to the 505s as its to short n tbh was trying to work out how I release the drive shaft to wheel end gear… will have to abandon that and look for a 505 with so …also the full crank victa is still a non starter turned fuel tap off then tried to restart and no .. So I guess its not flooding so I’m all out of idears wen it dose this I take the plug out and is wet with fuel and there’s always a spark

    • too bad about the compatibility of parts between the 505 & 550, It seems to be a tricky problem with your full crank motor, I would try the following, Replace spark plug if its not already new. Remove decompressor and plug hole with old spark plug to rule out decompressor issues, And finally replace any orings that have not been replaced already.

  18. Thanks lachlan have changed g4 for one I know is good problem stiil the same plugs new compression test returned 90 psi first time then second time 83 engine cold is this still within the parameters of acceptable for a working engine? so I can’t think of anything only thing that was odd wen I had it was the top crank seal was out of its recess tho am sure it was running like that I pressed it back in with intention of ordering new dose not make sens I thought bottom end needed to be sealed I’m thinking of getting another engine

    • Hi Karl

      Those compression readings are not high but most Victa engines will start and run with anything from about 70 PSI Up, Erratic running conditions tend to occur at such levels of compression, Above 85 Most Engines would run normally. Yes the bottom end does need to be sealed, Engines will often run with small leaks but will lack power and may change revs without throttle adjustment due to the air leaks.

  19. Thanx Lachlan we’ll I know when it is running it doesn’t miss a beat revs are constant at idle and wide throttle.. I’m not sure what else could be causing it not to start second time ‘feel I’ve covered everything …I’ve recently brought 2 more victas that I believe are the same engine but with the g3 carb a vc 160 and 160 auto drive. Thinking of referbishing one and maybe use the other for parts not sure at the moment obviously its probly abit silly replacing a 1977 engine with 73 oh wel and prob a shame to brake one up … The drive bar lever is missing off the auto drive and I think its near on impossible to source one of those .. Can anyone tel me if the operation for drive is the same? The spring loaded wheel that aplys pressure to the belt…. Me thinking I could replace handles for one with the standard self propelled black plastic lever to do the job of the missing drive bar.. Also do these engines have points ?

    • It does seem a very odd problem you have encountered as you have addresses all the possible causes that I am aware of. I am not sure about the auto drive setup as I have not taken one apart. I believe the early VC 160’s run points if so they are located underneath the flywheel.

  20. hey ah I have a self propelled victa 2 stroke 550 series side discharge mower! runs like a dream starts first go. idles like a purring kitten. I have found out that when it runs at high revs tho that it shakes and vibrates badly.. when running so much that without knowing it, it drops to the bottom height setting and cuts dough nuts in my lawn??? ugh..

    How can I fix this sudden problem.
    Redcliffe QLD Australia

    • Hi Jason

      Large vibrations are not a good sign, There is a few things it can be.

      1. The blades may have become unbalanced, To fix this new blades and a through clean of the blade carrier should work.
      2. The Engine is over revving and running faster then it should, This will be due to air leaks in the crankcase or intake
      3. The Engine bearings are worn out and in need of replacement.

      • Hello!

        Wow I didn’t expect a reply? Im guessing its number 3.. I put new blades on it regularly, its definitely not over revving, runs smooth and idles at low revs. just love this old type mower my dad had one when I was a kid, you cannot get side discharge mowers that are self propelled these days with out paying big dollars!!!! and its a trusty 2 stroke. cheap to run.

        engine Barings? hmm any idea what they might cost and are they available.

        Thankyou for your reply.

        • They are available, Cost will be around $30 plus shipping depending on which type of Victa Engine you have on the mower, The older type has more bearings then the more modern models.

  21. Dear Victa specialist.
    I have Victa 35 clasic for same years with no one problem.Last week I changed blades, but
    I make mistake because I turn the mower on side and now is making smoke and running
    Please give me advice on how to fix this problem.
    Many thanks.

    • Hi

      You will need to make sure the carburetor is free of oil as when tipped it may have filled up, Your fuel tank could also have oil in it, If you clean the carburetor & fill with fresh fuel then leave the mower running for a few minutes the smoke should clear up

  22. Hi I’ve got a problem with a mower layup similar to the one in the video ato the top of the page – when I try to start it, you can only pull the cord a short distance before it becomes very hard to pull, and there is smoke coming from the motor where the fuel line does into the motor.
    Any suggestions?

    • Hi Adam

      There is two things that usually cause this, The blade carrier being loose, Not mounted or incorrectly mounted. Or the decompressor having a fault. I would first check the blade carrier is mounted firmly you should not be able to rotate it at all without the engine also rotating, Be sure to test it with the spark plug lead removed for safety.

  23. No voltage coming from ignition to create a spark.tryed a tester held to lead that connects to spark plug but no reaction from tester

    • You will need to further troubleshoot the issue by removing and testing the coil for continuity with a multi-meter. Depending on the coil in your mower you will be looking for around 9 Kohms or 14 Kohms read from the spark plug lead to the inputs on the coil.

    • The wires are moved when the throttle cable moves in order to turn off the mower, when not it contact the mower can run, when the wires torch the ignition coil is shorted out and will not produce a spark.

  24. Victa 2-stroke, about 10 y.o.
    Left out overnight in the rain. Oops.
    Fuel tap was still on. Double oops.

    When I pull cord, I get a dead-stop blockage like there is water in the cylinder….

    But it isn’t. It’s fuel. When I release the tension I can back up the cord a bit and then it will go around, until the next block.

    The fuel pours out of the exhaust onto the blade disc, and then being thrown around by the disc as I try starting it.

    • Hi Mate

      This can happen sometimes when the fuel tap is left open as in your case, The only thing to do is remove the spark plug and pull the starter until the cylinder is mostly empty, Once empty you will probably need to leave the spark plug out and put the mower in the sun for a few hours to evaporate the remaining fuel. Once the cylinder is dry you should be able to start as usual.

  25. Hi Lachlan,

    Fantastic website. I serviced my Victa Mastercut 460 today. Everything is pretty good. Carby is clean, the mower starts pretty well. Air filter is clean.

    It runs well and doesn’t stall – but is moderately smokey (white smoke). There is no obvious signs of fuel/oil leaking out whilst running) I’m not sure what the next step is.

    Should I –

    1. Check the fuel/oil ratio mix and experiment.

    2. Check the decompressor ( I guess not, as it runs fine?)

    3. Check somewhere else for leaks (loose fittings/seals?)

    4. Run it for longer and let it warm up. Do you warm a mower up on low revs or higher revs?


    • Hi Charles

      White smoke is generally caused by water, If it is cold or wet where the mower is stored water can accumulate in the exhaust from condensation, Warming up the mower should clear up the white smoke, If not you should empty the fuel tank and check the mix is correct,

  26. Hi. My husband has a victa 2014 550ex vcs469 18″mower. He has taken the blade plate off to scrape all build up of dirt off. Put plate back on. Put new blades on 19″ ca09470b blades, which were recommended to us at the hardware store. Now the mower doesnt cut the grass at all. Blades are correctly put. Help!

    • Hi Lucy

      That sounds like an unusual issue, It would be best if you contact us via email using the contact page, If you can provide some pictures of the mower and the blades install we will do what we can to help.

  27. Hi , my Victa mower mulcher 2 stroke stopped running . In the top of the plastic seems a hole has melted through and very hot air was blasting out of it . Sounds like there is no exhaust attached any clue as to what has happened ?

    • It sounds like there is a problem with your exhaust maybe a hole has formed due to rust and the hot air has melted through the plastic?

  28. Hi, how are you? Now this is a bit of a strange one. I was half way through mowing my lawn ( the lawn was a little wet ) and the mower stopped dead. It did it once before in the past and I fix the problem, changed the spark plug. No prob. It’s a Victor 2 stroke Hurricane. I did the same. The old spark plug was little hard to get off, ( it took a little force ), but I got it off. I replaced it with exactly the same spark plug ,NGK BPMR4A. When I was tightening it up it got to the point when screwed in, a 1/4 turn more it would loosened again, it did it all the time. I tried to start the mower, when the plug was at its tightest, I got a bag and the spark plug blew out of it’s position. So it’s not tightening. I checked for fuel leaks, noticed when I turned the fuel on to start I saw a drop or 2 of petrol dropped out of cylinder. Not sure if is a leak or flooded. Not sure what’s happening. Thank you.

    • Hi Donny

      The problem is that you have over-tightened the spark plug and damaged the thread this means that it is no longer possible to properly install the spark plug without getting the thread repaired. In order to repair the thread you will either need to purchase a thread repair ki, Replace the whole cylinder head or take it to your local shop to have them repair the thread damage.

  29. victa 2 stroke motor 160cc it has a pully and belt connected to blades slasher
    the problem is it is not starting but when i transfer the motor to a push mower it does start ,,3 motors and all the same problem

    • Hi Dean

      The problem is most likely to be the tension of the belt being incorrect causing it to slip when the starter is pulled, The belt needs to turn the blades with no slippage otherwise the engines ignition timing is effected and it will not start.

  30. Have an 80 series motor,it has developed a problem where it only runs at top revs.Replaced carby and problem persists????

    • Hi Dave

      High rpms are most often due to air leaks, If you have replaced the O-rings in your carburetor then the most likely problem is worn out crankcase seals which are sucking extra air into the engine

  31. Hi Lachie,

    I have had some problems with the last couple of needles I’ve bought. They are getting caught in the jet and therefore not releasing petrol. Are they a fraction wide or is there something else askew? I bought one of the needles from you.



    • Hi Tony

      due to the nature of the plastic needles it is not an uncommon issue for them to get stuck as they have very little weight, In most cases a inspection for any rough spots and a light sand of the edges of the needle will solve the problem.

  32. Thanks, the old needles seem to be more reliable, ie ones from old mowers, is there any reason why the more recent ones are more problematic.

    • Hi Tony

      There is no reason we are aware of for the newer needles to perform worse than the older ones

  33. Hi Admin,

    I have similar symptoms as Roger on the 15 May 2014. My 2 stroke mower recently wont rev at full throttle and its sits at semi rev range regardless of throttle adjustment. I did have an issue where at full throttle was making the motor choke up and splatter all over the place but i have corrected that .It starts perfectly and idles OK. I have watched your fantastic tutorial videos for troubleshooting and the few part series of the G4 carburetor over and over a few times just in case i have missed a step.
    To date, I have checked and changed the spark plug, check the decompressor – working OK, change the petrol tap, fuel line, changed the needle, primer cap seal and checked the float operation – working OK, disassembled the carburetor a few times and checked the diaphragm, lifter, both springs, throttle body movement in carburetor , vacuum port on flywheel to see if its blocked, checked both vacuum hoses from decompressor to back/rear of carburetor and checked the vacuum hose from vacuum port to the top of carburetor and all seemed OK not blocked or cracked in any shape or form. To your knowledge has this something to do with the carburetor? right?

    on another note, i have a friend who’s one of of his 2 stroke is over revving, what do you suspect the issue is with that one

    What do you think the issue is?

    • Hi Vinnie

      There is a few things you can do to narrow down the problem, Does the mower blow alot of smoke? excess smoke and slower revs would suggest a rich fuel mix, You can test this by removing the air hosing that is connected to the carburetor and starting the mower, This should allow a significant amount of extra air into the carburetor and if this allows faster revs it would suggest your problem is too rich a mix, This can be caused by worn out parts or faulty brass jets.

      For Over revving the opposite is usually the case, You can test for a lean mix by removing the air filter then starting the mower, Once running use the handle of a screwdriver or similar sized object to block airflow into the intake pipe, The mower should either stop or slow down significantly, If this does not happen it means there is air leaks within the intake or crankcase causing a lean fuel mixture and fast rpm. Things to check to solve this are looking for cracks in the air intake hose, Checking the rubber boot & plug in the carburetor are properly installed, or if a on/off switch has been installed instead making sure to plug the whole up, Replacing carburetor manifold o-rings, checking both the top and bottom crankcase seals. Brass poppet valve spacers can also be installed to slow engine rpm as seen in this video:

  34. Hi again Lachie,

    I’ve noticed that my Powertorque won’t run when in Start position the way it used to. It will run fine though when I move the throttle control to the Run position. Does this suggest that there may be an air restriction?



  35. I should have said in the previous post that it doesn’t start in the Start position but it starts in the Run position. It runs ok if I move into Start position it just won’t start from it.

    • It does suggest that when on the start position there is a change to the air/fuel mix it is difficult to determine the exact reason for the change in starting position It if works fine starting on run its probably best to leave it that way.

  36. Hi, I have a victa 35 classic that appears to run okay, but slows in rpm and stops after 20mins running. Starts and runs good again after a rest, and then shuts down again after a short time. I have changed the spark plug, but this made no difference. Many thanks for any advice. Cheer, Phil.

    • Hi Phil

      Its possible that it is the ignition coil they can fail when the mower warms up, Otherwise you can get Vapour lock in the fuel/air intake when it gets hot if the mower is clogged full of grass under the pull start housing

  37. I have a Victa 2 stroke and it runs extremely high and very noisy. I also think that it is using more fuel than it used to. Can you pleas advise what I should be looking into. Many thanks

    • Hi John

      Fast running is most often caused by air leaks in the carburetor, crankcase or intake. It is best to start with the intake and carburetor and check all the o-rings. It is also worth checking that the vacuum hoses are properly connected and that there is no cracks in the carburetor body.

  38. Hi

    Don’t know what’s happening but mid-mow I am suddenly mowing crop circles as the front of my mower is now on the ground and lower than the front wheels. Wondered if the height adjustor caught on something and moved but I am not sure that is the case, Any ideas please? Thanks.

    • Hi Jillian

      It could be that the height adjuster has vibrated out of its mounts, I would also check that the linkage at the front of the mower is properly connected aswell as the front axle clips being installed. Damage to these parts can cause the front end to collapse

  39. Hi, we bought a Victa concept lawnmower from a trustie bloke who had no issues with it. It keeps blowing out the spark plug. Even a brand new one. My boyfriends no mechanic & wants to glue it in. Any advice please?

    • Hi Carolyn,

      The thread that the spark plug fits into will be damaged this is why the spark plug does not stay in while the engine is running, Gluing the spark plug may work with a strong epoxy but would not be a good solution if you ever need to replace the spark plug. The best solution is to take the mower to a local shop and ask them to repair the spark plug thread.

  40. Hi I have a victa two stroke it will start but wont keep running , I have cleaned out the fuel tank put a new fuel tap and filter in changed the cap on the carby any thing else I can do.

    • It sounds like your have a blockage in the carburetor, I would recommend you strip down and clean the carburetor, If any parts look worn I would replace them, The most likely culprits are the Diaphragm, Primer Cap, Needle & Brass main jet.

  41. hello,
    I have an old Victa edger but uncertain of its year. I have removed the kill switch for testing so I know that’s not an issue. I have a very good spark and doesn’t require much effort to make it. My decompressor is in top condition and tested to be fine, no leaks and pulls the plunger in, also all vacuum hoses are fine and do not leak. I have pulled the carby apart and the diaphragm and other components are good and all fuel passages are clear. I removed the exhaust and it is clear although some more packing might be needed, there is fuel present at the intake and exhaust ports suggesting fuel is going into the cylinder and unburnt fuel is exhausted so that appears ok. I have also tried putting fuel straight into the cylinder with no luck either. Compression test gives me 95 to 100 Psi depending on how vigorous I get with the start cord yet it will not start. I cannot find any leaks or issues with the crankcase and inside the engine is very clean with no scoring or any other problems but I am still at a loss as to why it will not start. the only thing I can think of is that the spark plug open ccts when tightened into the head of the engine but I haven’t had time to get a replacement and think it an unlikely cause. Am I missing anything???

    • Hi Chris

      It sounds like everything is working as it should and that there is no reason your mower should not be running, It would be a good idea to try a new spark plug as they can sometimes be faulty only under operating conditions and that is about the only thing it could be at this point. If you have fuel and compression it must be a spark related issue.

  42. Any advice please? I can’t get my Victa VC 500 to start. I’ve taken off the carby cover, cleaned it, checked float, checked primer, all good . I’ve removed the decompressor and it seems to be working okay. New plug and it checks out.

    But when I pull the cord, I hear a “chuff chuff chuff” sound, in time with the motor turning. But the motor doesn’t catch. Sounds like an air leak somewhere. Any idea what this could be? Thanks.

    • Hi Greg

      The chuff sound you are hearing is most likely to be a damaged head gasket allowing the combustion pressure to escape and making your mower fail to start. Simply remove the 4 bolts on the cylinder head to inspect the gasket and determine if this is the case.

    • Hi Bernie

      Yes the revs should be able to be adjustable with the throttle cable, from about 1500rpm to 3500rpm. If you mower is consistently revving fast and cannot be slowed this indicates it may have problems within the carburetor or engine causing an incorrect fuel mix

  43. Hi all,

    I’ve got a 2-stroke PowerTorque 2 engine that I can’t get to fire. I’ve disassembled, cleaned, and re-assembled the carby, replaced the primer bulb faceplate and seal, replaced the rubber cut-off grommets, tried 2 spark plugs which both appear to have good spark, replaced the crankcase seal (Pull-start seal, not lower), tested with another decompressor, performed a compression test (Appears normal), put fresh 2-stroke mix in, confirmed there is fuel on the plug after trying to start it (After I had previously cleaned the plug)… I’m pretty much out of ideas. Fuel and air appear to be getting through, I tried taking off the throttle hose in case there was an airflow problem, I’m of course ensuring the throttle isn’t in the off position… the only thing I can think of is that the lower seal may have gone? But I’m less inclined to believe that. The last thing I can think of is that the spark plug boot was destroyed and has been removed, but I have tried covering that in electrical tape and I’m still getting what appears to be a great spark when tested out of the engine. Also, I tried removing the decompressor and fuel lines, putting a small amount of fuel in the spark plug hole, then starting it. The engine fired once and the flame came out of the decompressor port, so I know that the fuel can ignite. Any ideas?

    • Hi Paul

      Sounds like you have done all the usual things that we would suggest to get the mower going, The fact that it fired up suggests that there is enough compression & spark which really only leaves and fuel/air mix issue. I have one suggestion that could help diagnose a fueling issue. Buy some “Start ya bastard” or similar spray then take the air filter cap of and remove the air filter, Spray some down the intake hose maybe a 2 second or so spray then try and start the mower it should get going within 10 or so pulls. If the mower fires up and you can keep it running by intermittently spraying down the intake tube then it confirms there is an issue with fuel getting through the carburetor.

      Be mindful these starting sprays have no lubricating oil so you only want to run the mower for a short time this way.

  44. Hey fellas, thanks for all the vids and question reply’s. Awesome stuff. I have a similar problems to old mate Paul in the comment above. I’ve taken the same steps he has and also replaced the boot on the spark plug. I ran some Start Ya Bastard through the air intake and she worked a treat. But it won’t run if I stop spraying. I’ve already cleaned and replaced the seals diaphragms in there. Any other ideas?

    • Hi Aaron

      It sounds like a fueling issue, I would check that the vaccum lines connected to the decompressor and the vaccum port on the flywheel are not blocked up. You could also try removing the fuel needle and trimming it down approx 0.5mm to 1mm this increases fuel flow into the engine and can in some cases resolve these kinds of issues.

  45. Hi,

    I bought a Victa 750is with instatnt start after Easter 2018 and used once. Now Spring is coming, I need to mow my front garden.

    But with fresh/full charged battery, new petrol, it won’t start. The only thing I can think off is to clean its sparkplug but accessing this park is a challenge.

    Do I need to do anything else or return it under warranty ?


    • Hi Joe

      If it’s in warranty that would be the best route to take rather then spending your own time, Effort and money trying to sort out the issue. That being said the troubleshooting methodology to follow is the same as the video, An engine needs spark, Air/Fuel & Compression to start. Being Rather new I would expect the issue to be either spark plug related or some old fuel has blocked up the carburetor.

  46. Hi, my Victa Lawnkeeper V40 leaks fuel from the carby. All nuts and bolts are thought. Would you think the Gasket is rooted?

    • Hi Dave

      The most common causes are either a damaged oring, Or the float & needle behind the cap are stuck and the carburetor bowl is overflowing

  47. Hi,

    I have a Victa lawnkeeper V40. The height Adjuster coil spring has broken. I have managed to get a replacement one.

    However i am having problems replacing it and would appreciate your knowledge on how pull it/stretch it so i can attach it back to the height adjuster bar and body of lawnmower.

  48. Cheers for all the informative info mate

    I have a 1983 victa mustang 160cc with electronic ignition. I bought a carby service kit but i quickly realised the carb only has the small spring and a small clip washer holding the diaphram down there is no large spring . The mower fires up but dies and doesnt continue to run could this be due to the missing spring? its getting plenty of fuel has good spark. Any ideas on what the issue can be ?

    • Hi Mate

      It’s possible that the missing large spring is causing your issue. With a small or missing spring there would not be much pressure to keep the main valve open witch could make the mower stall.

  49. Hi there. Have a Super 70 Victa side discharge!, now 46 yo.. Bright sparks decided to give the good working machine a pressure wash. After removing the carb for water and moisture in the points etc all went together ok. But I think the air vane govenor got disturbed as it ran only a bit over idle ( for last 10 yrs has run at 1/2 _ 3/4 speed without falter. Can you advise how to adjust the vane as per factory specs. Thanks and regards. Brian

    • Hi Brian

      The victa’s are governed by vacuum. This is usually generated from the port in the flywheel housing that has a tube running to the carburetor. It could be that you have cleaned this out and now the governor has improved vacuum reducing rpm. Other then this being the cause slow rpm is usually a rich fuel/air mix you can check if this is the case by either removing the air filter or disconnecting the intake hose from the carburetor and seeing if the rpm increases.

  50. Hello.
    Thanks for all the knowledge you’ve imparted.
    Victa 160cc 2 stroke. Won’t start.
    It has spark and compression. I’ve sprayed “start ya bastard” into the cylinder, it fires for a few seconds, then succumbs.
    The carburettor has been cleaned thoroughly and a kit installed.
    Cut out wires removed.
    Muffler has good flow through.
    Good fuel.
    No more ideas. Well, there’s always The Gap.
    Any help would be most welcome.

    • Hi Tony

      It sounds like a fueling issue if it fires with “Start ya bastard” but not by normal means. I would check that the carburetor bowl is actually filling up with fuel they can sometimes get a stuck needle and not fill up. If that does not work there must be either a large vaccum leak so the fuel is not sucked into the cylinder or a blockage in one of the tiny holes inside the carburetor. Most commonly the hold behind the brass jet can be blocked.

  51. Hello.
    I thank you, too, for assisting so many of us in this way.
    I have a Victa 160cc two stroke that started making a loud clanking sound on start up and shut down. I silenced it (fixed it??) by tightening the 5/8 nut fixing the blade disc to the rotor. (I did disassemble and inspect – the teeth on the rotor and washer look quite good, but there was clear evidence of the cutter disc rotating under the washer.)
    It appears that it relies on simple friction between the washer and the disc to drive the blades. So torqueing that nut correctly would seem to be important. Is there a recommended setting? And, more importantly, how do you hold the rotor while tightening that nut?

    • Hi Roman

      The torque spec for the blade carrier nut is 67-75 Nm. One of the quickest methods to stop the motor rotating is to remove the spark plug and stuff some start cord or similar material into the cylinder to stop the piston moving ensuring you leave some hanging out. Once tightened pull the cord back out. Alternatively if you don’t have anything small you can completely remove the cylinder head and stuff the bore with a rag then place the head back on.

  52. I have a victa V40 4 stroke mower that is leaking excess oil from the carb side of the engine, also it is trying to push oil from the oil filler tube

  53. I couldn’t believe there is a group like this dedicated to push mowers its great to see. I recently got a victa vc300 160 power torque I believe and it starts runs for a couple seconds then dies. It continues to run if i keep pushing the primer bulb. I replaced the plug, replaces the float needle yellow type, new oring on float cover but diaphragm looks ok so does the rest, gave it a good clean. It was running ok but had a clunk found it to be a loose blade carrier i will tighten that tonight. Anything you suggest to look at? I will check decompressor tonight. Got it for 30 bucks hoping to touch it up to isr as my dethatcher. Thanks guys.

  54. I have a Victa 160cc
    Recently, when I cut the Lawn on a 30-degree angle and the Carby is on the lower side. It runs fine,
    However, when I turn it around, the motor It cuts out within seconds (no revving) it is like I have shut it off. (The fuel tank is full)

    • I’ve got the same problem as Leigh, carby down my old Victa mower works great. Mowing downhill or angled so the carby is higher – mower dies. I can keep it going by tilting the mower to be flat, or pressing the primer bulb a few times, so I think it has to be fuel starvation, but the why has me strumped.

      I’ve had other issues before now after hitting a stick and have replaced o-rings, diaphragm, head gasket, primer cap and needle, pulled apart most of the mower really. New fuel didn’t help. I’ve got it starting nicely now, but while I did manage to mow the lawn, it was painful!

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