2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 533Get this manual
TROUBLESHOOTING
ENGINE LACKS POWER
1Drive Train Inspection Raise wheel off the ground and spin by handDoes the wheel spin freely? NO YES Brake dragging Worn or damaged wheel bearing Damaged differential or final drive bearing Faulty differential or final drive
GO TO STEP 2
2Tire Pressure Inspection Check tire pressureAre the tire pressures low? YES Faulty tire valve Punctured tire NO GO TO STEP 3
3Engine Condition Inspection Accelerate lightlyDoes the engine speed increase? NO YES Fuelair mixture too rich or lean Clogged air cleaner Restricted fuel flow Clogged muffler Restricted fuel tank breather hose