ENGINE
3.66
SPARK PLUG FOULING TROUBLESHOOTING
SSpark plug cap loose or faulty
SChoke cable adjustment or plunger/cable sticking
SForeign material on choke plunger seat or plunger
SIncorrect spark plug heat range or gap
SCarburetor inlet needle and seat worn
SJet needle and/or needle jet worn or improperly adjusted
SExcessive carburetor vibration (loose or missing needle jet locating pins)
SLoose jets in carburetor or calibration incorrect for altitude/temperature
SIncorrect float level setting
SPVT system calibrated incorrectly or components worn or mis-adjusted
SFuel quality poor (old) or octane too high
SLow compression
SRestricted exhaust
SWeak ignition (loose coil ground, faulty coil, stator, or ETC switch)
SETC switch mis-adjusted
SRestricted air filter (main or pre-cleaner) or breather system
SImproperly assembled air intake system
SRestricted engine breather system
SOil contaminated with fuel
SRestricted oil tank vent
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