ENGINE / TRANSMISSION
TROUBLESHOOTING
Spark Plug Fouling
• Spark plug cap loose or faulty
• Choke cable adjustment, cable or shaft sticking
• Incorrect spark plug heat range or gap
• Carburetor inlet needle and seat worn
• Jet needle and / or needle jet worn or improperly adjusted
• Loose jets in carburetor or calibration incorrect
altitude/temperature
• Incorrect float level setting
• CVT system calibrated incorrectly or components or
mis-adjusted
• Fuel quality poor (old)
• Low compression
• Restricted exhaust
• Weak ignition (loose coil ground, faulty coil,
Engine (General)
Engine Turns Over But Fails to Start
• No fuel
• Dirt in fuel line or filter
• Fuel will not pass through fuel valve
• Fuel pump inoperative / restricted
• Tank vent plugged
• Engine flooded with fuel
• Low compression (high cylinder leakage)
• No spark (Spark plug fouled)
Engine Does Not Turn Over
• Discharged battery
• Loose or corroded battery terminals / cables
• Starter motor electrical circuit faulty
• Engine seized or mechanical failure
• Kickstart components damaged
Engine Runs But Will Not Idle
• Carburetor pilot (idle) circuit restricted or blocked
• Carburetor misadjusted
• Choke not adjusted properly
• Low compression
• Insufficient valve clearance (too tight)
• Crankcase breather restricted
• Air filter restriction
• Old (degraded) fuel
• Incorrect ignition timing / sheared flywheel key
Engine Idles But RPM Will Not Increase
• Spark plug fouled/weak spark
• Broken throttle cable
• Obstruction in air intake
• Air box removed (reinstall all intake components)
• Incorrect or restricted carburetor jetting
• ETC switch limiting speed
• Reverse speed limiter limiting speed
• Carburetor vacuum slide sticking/diaphragm damaged
• Incorrect ignition timing / sheared flywheel key
• Restricted exhaust system
• Cam lobe worn
Engine Has Low Power
• Spark plug fouled
• Cylinder, piston or ring wear or damage (check compression
/ cylinder leakage)
• CVT not operating properly
• Restricted exhaust muffler
• Dirty / restricted carburetor
• Cam lobe worn
4.24
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