Troubleshooting; Spark Plug Fouling; Engine (General) - Polaris PREDATOR 50 2009 Manual

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 for
altitude/temperature
• Incorrect float level setting
• CVT system calibrated incorrectly or components worn
or mis-adjusted
• Fuel quality poor (old)
• Low compression
• Restricted exhaust
• Weak ignition (loose coil ground, faulty coil, stator, or
ETC switch)
• ETC switch mis-adjusted
• Restricted air filter (main or pre-cleaner) or breather
system
• Improperly assembled air intake system
• Restricted engine breather system
• Oil contaminated with fuel
• Restricted crankcase vent (engine breather)
3.44

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