86 Excel III running on one cylinder - Snowmobile Forum: Your #1 Snowmobile Forum

dan0688 · 02-14-2008, 11:46 PM

i just recently bought this snowmobile not running.. cleaned up the carb got it to run but only on one cylinder, its a 340 btw... checked both cylinders for compression both have compression, both have spark, so at that i replaced the plugs. still one cylinder, i swaped the wire to oposit cylinders and now its ran still on one but the other cylinder, so i assumed that a coil could be at fault, so i replaced the coil, the same problem still exists and i am clueless as to what to do next, (btw none of the lights are functional and probably a wireing nightmare.. but i dont know where to begin to look, i have wiring diagrams though) both wires seem to have spark also... i mean they got me pretty good when i tryed to pull one running... stupid.. but eh.. so any ideas are much appriciated,
Thanks
Dan

**smallengineguy** · 02-15-2008, 07:03 AM

If you switch wires, the other cylinder fires? The coil or the boots that go on the plugs can be the only problem.

a guy · 02-15-2008, 11:04 AM

I just had a similar problem. Get two new caps NGK caps are good and about $5 ea. Yank your plugs and spray them out with ether to get evrythinng clean or use a propane torch so they conduct incase you fouled one. Dry them off and install. The caps often fail.

Out