Polaris A07MH50AX Offroad Vehicle User Manual


 
3.53
ENGINE
3
TROUBLESHOOTING
Spark Plug Fouling
Spark plug cap loose or faulty
Choke cable adjustment or plunger/cable sticking
Foreign material on choke plunger seat or plunger
Incorrect spark plug heat range or gap
Carburetor inlet needle and seat worn
Jet needle and/or needle jet worn or improperly
adjusted
Excessive carburetor vibration (loose or missing
needle jet locating pins)
Loose jets in carburetor or calibration incorrect for
altitude/temperature
Incorrect float level setting
PVT system calibrated incorrectly or components
worn or mis-adjusted
Fuel quality poor (old) or octane too high
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 oil tank vent
Engine
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
Carb starter circuit
Engine flooded
Low compression (high cylinder leakage)
No spark (Spark plug fouled)
Engine Does Not Turn Over
Dead battery
Starter motor does not turn
Engine seized, rusted, or mechanical failure
Engine Runs But Will Not Idle
Restricted carburetor pilot system
Carburetor misadjusted
Choke not adjusted properly
Low compression
Crankcase breather restricted
Engine Idles But Will Not Rev Up
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
Restricted exhaust system