2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 561Get this manual
TROUBLESHOOTING
ENGINE LACKS POWER
1Drivetrain Inspection
Raise wheel off the ground and spin by hand
Does the wheel spin freely?
NOBrake 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 pressure
Are the tire pressures correct?
NOFaulty tire valve Punctured tire
YESGO TO STEP 33Engine Condition Inspection
Accelerate lightlyDoes the engine speed increase?
NOClogged air cleaner Restricted fuel flow Clogged muffler Restricted fuel fill cap breather
YESGOTO STEP 44Engine Condition Inspection