2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 534Get this manual
TROUBLESHOOTING 7Cylinder Compression Inspection Test cylinder compressionIs the compression low? YES NO Valve clearance too small Valve stuck open Worn cylinder and piston rings Damaged cylinder head gasket Seized valve Improper valve timing
GO TO STEP 8
8Carburetor Inspection Check carburetor for cloggingIs the carburetor clogged? YES NO Carburetor not serviced frequently enough GO TO STEP 9
9Engine Oil Inspection Check oil level and conditionIs there correct level and good condition? NO Oil level too high Oil level too low Contaminated oil YES GO TO STEP 10