2004 Polaris Predator Owners Manual - Page 172

TROUBLESHOOTING Engine Pings or Knocks Possible Cause Poor quality or low octane fuel Incorrect ignition timing Incorrect spark plug gap or heat range Solution Replace with recommended fuel See your Polaris dealer Set gap to specs or replace plugs Engine Backfires Possible Cause Weak, fouled or defective spark plug Incorrect spark plug gap or heat range Old, poor or non-recommended fuel Incorrectly installed spark plug wire Incorrect ignition timing Mechanical failure Solution Inspect, clean and/or 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 169