Please post a pic of plugs. What is causing the plugs to foul?
Best way to answer your question may be to take an old plug, bent the metal tip on plug to short it out completely. If engine them runs on one good plug and one shorted plug, then there has to be enough energy from coil to run bike.
Do your plugs foul because engine is burning oil, oil fouled? Or are they just carboned up because you don't have complete combustion?
I have a kohler command, 20 hp. One cylinder would turn plugs black because of incomplete combustion. Engine passed compression and leak down test. I finally pulled head, lapped in the valves, works great.
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