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ENGINE
SPARK PLUG FOULING
TROUBLESHOOTING
G
Spark plug cap loose or faulty
G
Choke cable adjustment or
plunger/cable sticking
G
Foreign material on choke plunger
seat or plunger
G
Incorrect spark plug heat range or
gap
G
Carburetor inlet needle and seat
worn
G
Jet needle and/or needle jet worn or
improperly adjusted
G
Excessive carburetor vibration
(loose or missing needle jet locating
pins)
G
Loose jets in carburetor or calibration
incorrect for altitude/temperature
G
Incorrect float level setting
G
PVT system calibrated incorrectly or
components worn or mis-adjusted
G
Fuel quality poor (old) or octane too
high
G
Low compression
G
Restricted exhaust
G
Weak ignition (loose coil ground,
faulty coil, stator, or ETC switch)
G
ETC switch mis-adjusted
G
Restricted
air
pre-cleaner) or breather system
G
Improperly assembled air intake
system
G
Restricted engine breather system
G
Oil contaminated with fuel
G
Restricted oil tank vent
TROUBLESHOOTING
Engine Turns Over But Fails to Start
G
No fuel
G
Dirt in fuel line or filter
G
Fuel will not pass through fuel valve
G
Fuel pump inoperative/restricted
G
Tank vent plugged
G
Carb starter circuit
3.46
filter
(main
or
G
Engine flooded
G
Low compression (high cylinder
leakage)
G
No spark (Spark plug fouled)
Engine Does Not Turn Over
G
Dead battery
G
Starter motor does not turn
G
Engine seized, rusted, or
mechanical failure
G
Recoil components damaged
Engine Runs But Will Not Idle
G
Restricted carburetor pilot system
G
Carburetor misadjusted
G
Choke not adjusted properly
G
Low compression
G
Crankcase breather restricted
G
Air filter restriction
Engine Idles But Will Not Rev Up
G
Spark plug fouled/weak spark
G
Broken throttle cable
G
Obstruction in air intake
G
Air box removed (reinstall all intake
components)
G
Incorrect or restricted carburetor
jetting
G
ETC switch limiting speed
G
Reverse speed limiter limiting speed
G
Carburetor vacuum slide
sticking/diaphragm damaged
G
Incorrect ignition timing
G
Restricted exhaust system
G
Cam Lobe worn
Engine Has Low Power
G
Spark plug fouled
G
Cylinder, piston, ring, or valve wear
or damage (check compression)
G
PVT not operating properly
G
Restricted exhaust muffler
G
Carburetor vacuum slide
sticking/diaphragm damaged
G
Dirty carburetor
G
Cam lobe worn
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Chapters
Table of Contents
Troubleshooting
