Victa On/Off Switch Installation

Learn how to bypass the Victa G4 carburetor ignition with a simple on off switch.

Tools/Parts Required 

  • Phillips Head Screwdriver
  • Wire Trimmers & Cutters
  • Electrical Tape
  • Cable Ties
  • Solder & Soldering Iron (optional)
  • Spark Plug Tool
  • Drill
  • On/Off Switch & Wiring

Step 1.

Remove the top cover and place it aside.

Step 2

Twist the carburetor off and pull out one of the ignition wires, the black one is usually easiest.

Step 3

If your lawn mower previously had no spark (click here to watch video on testing spark plug), and if it now has a spark it means your G4 carburetor is worn out and the ignition wires are contacting. If you still have no spark your problem is likely the ignition coil, which we will feature in future video.

Step 4

If your problem is the carburetor ignition, we can bypass it with a switch, making it much more reliable. To do this remove the second wire from the carburetor as shown in the video.

Step 5

Next, strip the wires and connect the extra wiring you have prepared. Then mount your switch and connect it to the wires, it will only matter which wire is connected to which if you have a toggle switch – reversing the wires will reverse the on/off parts of the switch.

Step 6

Create a hole in the cover of the lawn mower for the switch to mount to. Thread the wires through this hole, then connect them to the on/off switch and tighten the switch to the cover.

Step 7 

Once the switch is installed you can replace the black rubber cover on the carburetor to stop dirt & excess air being sucked in.


    • The Purpose of the switch is to turn the ignition On or Off so you should turn it on if you want to start your mower and off if you’d like to turn your mower off.

      • what about preventing the hole in the carb from sucking air? i’m having issues with an LM carb sucking air & leaning out the mixture after trying a simpler version of this

        • Hi

          if it is causing your mower to run lean you can easily plug up the hole, either by buying the small rubber plug, using some duct tape or even some silicone anything that will stay in place and stop the air flowing.

  1. Have fuel after replacing float housing, have spark after following your adaption to ignition, replaced head gasket and did head bolts up evenly and firm, but still have chuffing noise coming out carby by inlet. No compression – no start…Took carby off as chuffing coming from inlet base without carby on. Hence losing compression from port. Victa lawnmower same as the Red model you have done the ignition bypass video on…any ideas?

    • Hi David

      as the piston moves up and down air will cycle in and out of the port as the conditions change. To lose compression out of the inlet port your piston rings would need to be in very poor condition as the inlet port should be covered by the sidewall of the piston during the compression stroke. Compression issues are most often due to worn out piston and rings or a faulty decompressor

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