2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 535Get this manual
TROUBLESHOOTING
POOR PERFORMANCE AT LOW AND IDLE SPEED
1Pilot Screw Inspection Check carburetor pilot screw adjustmentIs the adjustment correct? NO YES See page 5-19 GO TO STEP 2
2Intake Air Leak Inspection Check for leaking carburetor insulatorIs there leaking? YES Loose carburetor insulator bands Damaged insulator NO 3Spark Test Perform spark testIs there weak or intermittent spark? YES NO Faulty spark plug Fouled spark plug Loose or disconnected ignition system wires Broken or shorted spark plug wire Faulty ignition coil Faulty ignition pulse generator Faulty engine stop switch Faulty ignition switch Faulty engine control module (ECM) GO TO STEP 3