2004-2007 Honda Aquatrax ARX1200N3/T3/T3D Factory Service Manual, Page 493Get this manual
TROUBLESHOOTING Is there knocking? YES Use of poor quality fuel Worn piston and cylinder Excessive carbon build-up in combustion chamber Ignition timing too advance (Faulty ECM)
GO TO STEP 3
3Spark Plug Remove and inspect the spark plugsAre the spark plugs fouled or discolored? YES NO Plug not serviced frequently enough Incorrect spark plug heat range GO TO STEP 4
4Engine Oil Check the oil level and conditionIs the oil level okay and free of contaminants? NO Oil level too high Oil level too low Contaminated oil GO TO STEP 5
5Ignition Timing Check the ignition timingIs the ignition timing correct? NO YES Faulty engine control module (ECM) Faulty ignition pulse generator GO TO STEP 6