2006 Polaris ATV Trail Blazer Owners Manual, Page 112Get this manual
TROUBLESHOOTING Engine Backfires
Possible Cause
Weak spark from spark plugs Incorrect spark plug gap or heat range Old or non-recommended fuel Incorrectly installed spark plug wires Incorrect ignition timing Mechanical failure
Solution
Inspect, clean andor replace spark plugs Set gap to specs or replace plugs Replace with new fuel See your Polaris dealer See your Polaris dealer See your Polaris dealer
Engine Runs Irregularly, Stalls or Misfires
Possible Weak Spark Cause
Fouled or defective spark plugs Worn or defective spark plug wires Incorrect spark plug gap or heat range Loose ignition connections Water present in fuel Low battery voltage Kinked or plugged fuel vent line Incorrect fuel Clogged air filter Reverse speed limiter malfunction Electronic throttle control malfunction Other mechanical failure