This Demonstrates the method of disassembling a Victa lawn mower ready for a replacement piston and rings.
Tools/Parts Required
- Small Rag
- Flat Head Screwdriver
- Socket Wrench - 8mm, 12mm & 13mm
- Locking Pliers
- Standard Pliers
- Needle Nose Pliers
- Victa Rebuild Kit
- WD40/Lubricant
Step 1.
Remove fuel hose & top cover bolts
Step 2
Use your 12mm socket wrench to remove the starter, be careful not to lose the rubber seal located on the underside of the starter.
Step 3
Next, remove the head by loosening the four 12mm bolts. The head may be stuck tight due to the head gasket. Gently pry the head away until it pops off.
Step 4
If there is no head gasket, or you suspect that the head gasket wasn’t sealing properly, you could try to replace the head gasket before replacing the piston and rings. The piston can be inspected by looking through the exhaust port to see if damage has been caused due to carbon build-up.
Step 5
Next, stuff the cylinder with the small rag and gently place the head on. This rag will stop the piston moving, allowing you to undo the crank pin.
Step 6
Use your locking pliers to grip the crank pin and the use your adjustable wrench to loosen (remember left to loosen), or, if you have the other crank pin use a screw driver and hammer to loosen.
Step 7
Now remove the head and take the rag out of the bore. Spray some WD-40 and push the piston out of the cylinder from inside the crankcase.
Hi guys, you mentioned that 40psi compression was too low to operate, can you let me know what a good pressure for a Victa 2 stroke is? Thanks Paul
Hi Paul
80-100 Psi is a good pressure, Victa mowers will usually still run between 60-80 Psi but will be lacking it power and harder to start.
Hello Lachlan, thx for your vids, you do a good job with them.I dont know if you can help me. I have a corvette 700 and have just overhauled the carby and starter cord,etc.plus new blades.
I then did some heavy duty mowing where the grass was v. long. All ok but then the engine slowly gave in and when attempting to restart i could feel and hear a light clunking in the engine
It doesnt do it with the plug out (I imagine due to no compression). It appears as tho the bottom of the piston is bumping up against the inside flat part of the starter housing ??? I can,t work out how or why other than either or both of the con rod bearings are gone,creating excess play. Does any of this ring a bell to you or any ideas to help me? I dont want to pull out the conrod and piston just yet to have a look!!
Thanks in advance for any ideas. Cheers Rod
Hi Rod
Without disassembling the engine to inspect the parts it’s hard to know whats causing the noise. It would seem unlikely that there was enough play for the piston to contact the starter housing, Noises could be cracked rings, Damage to the piston, cylinder or bearings. It could also be the starter not retracting.
As the noise is not present with the plug out it seems to be related to compression, Try removing the decompressor and replacing with a spark plug to eliminate it as a source of the noise.
Hi, thanks for the video. The crank pin on my Victa (VXS160 motor) is tight. I’ve made a tool from a 21mm socket, but the pin won’t loosen. I’ve soaked with WD40, heated with a torch and still won’t loosen. I’ve used a 1/2 drive on the socket-tool I made and extended this with a pipe…no good. I’ve also tried hitting the end of my drive with a hammer to loosen and it’s tight as ever. My home made tool is also burring after a few goes and keeps getting shorter as I regrind it! I may need to make another tool using a thick wall socket. Any other thoughts?