Table of Contents
Spark Plug Fouling - 2 Stroke Engines
Oil pump adjusted incorrectly
S
Adjustment (pilot screw)
S
Restricted air filter (main or pre-cleaner)
S
Improperly assembled air intake system
S
Oil pump shaft seal leaking (fills crankcase)
S
Oil pump arm or reel not returning properly (cable, arm or reel sticking)
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 in carburetor 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
Oil line check valve leaking
S
Spark Plug Fouling - 4 Stroke Engines
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 in carburetor 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)
S
Improperly assembled air intake system
S
Restricted engine breather system
S
Oil contaminated with fuel
S
Restricted oil tank vent
S
Polaris Sales Inc.
Spark Plug Fouling Checklist
3.113
ENGINE
4/99
Table of Contents
Troubleshooting
