2005-2006 Honda ATV TRX500FE/FM/TM FourTrax Foreman Factory Service Manual, Page 442Get this manual
TROUBLESHOOTING
ENGINE LACKS POWER
1Drive Train Inspection Raise wheel off the ground and spin by handDoes the wheel spin freely? NO YESBrake dragging Worn or damaged knuckle, hub or axle bearingGO TO STEP 22Tire Pressure Inspection Check the tire pressureAre the tire pressures correct? NO YESFaulty tire valve Punctured tireGO TO STEP 33Clutch Inspection Accelerate rapidly low to secondDoes the engine speed change? NOClutch slipping Worn clutch discsplates Warped clutch discsplates Weak clutch spring