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ENGINE
3.53
SPARK PLUG FOULING
S Spark plug cap loose or faulty
S Choke cable adjustment or
plunger/cable sticking
S Foreign material on choke plunger
seat or plunger
S Incorrect spark plug heat range or
gap
S Carburetor inlet needle and seat
worn
S Jet needle and/or needle jet worn or
improperly adjusted
S Excessive carburetor vibration
(loose or missing needle jet locating
pins)
S Loose jets incarburetor or calibration
incorrect for altitude/temperature
S Incorrect float level setting
S PVT system calibrated incorrectly or
components worn or mis-adjusted
S Fuel quality poor (old) or octane too
high
S Low compression
S Restricted exhaust
S Weak ignition (loose coil ground,
faulty coil, stator, or ETC switch)
S ETC switch mis-adjusted
S Restricted air filter (main or
pre-cleaner) or breather system
S Improperly assembled air intake
system
S Restricted engine breather system
S Oil contaminated with fuel
S Restricted oil tank vent
TROUBLESHOOTING
Engine Turns Over But Fails to Start
S No fuel
S Dirt in fuel line or filter
S Fuel will not pass through fuel valve
S Fuel pump inoperative/restricted
S Tank vent plugged
S Carb starter circuit
S Engine flooded
S Low compression (high cylinder
leakage)
S No spark (Spark plug fouled)
Engine Does Not Turn Over
S Dead battery
S Starter motor does not turn
S Engine seized, rusted, or
mechanical failure
Engine Runs But Will Not Idle
S Restricted carburetor pilot system
S Carburetor misadjusted
S Choke not adjusted properly
S Low compression
S Crankcase breather restricted
Engine Idles But Will Not Rev Up
S Spark plug fouled/weak spark
S Broken throttle cable
S Obstruction in air intake
S Air box removed (reinstall all intake
components)
S Incorrect or restricted carburetor jetting
S ETC switch limiting speed
S Reverse speed limiter limiting speed
S Carburetor vacuum slide
sticking/diaphragm damaged
S Incorrect ignition timing
S Restricted exhaust system
Engine Has Low Power
S Spark plug fouled
S Cylinder, piston, ring, or valve wear or
damage (check compression)
S PVT not operating properly
S Restricted exhaust muffler
S Carburetor vacuum slide
sticking/diaphragm damaged
S Dirty carburetor
Piston Failure - Scoring
S Lack of lubrication
S Dirt entering engine through cracks in air
filter or ducts
S Engine oil dirty or contaminated
Excessive Smoke and Carbon Buildup
S Excessive piston-to-cylinder clearance
S Wet sumping
S Worn rings, piston, or cylinder
S Worn valve guides or seals
S Restricted breather
S Air filter dirty or contaminated
Low Compression
S Decompressor stuck