'61HN252' by American Honda Motor Co. - Page 533 of 540
http://services.honda.com/ServiceManual/SVC_MNL/61HN253/61HN2...
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3/9/2008 11:33 PM
[2005-2008] [TRX500 FA/FGA]
TROUBLESHOOTING
ENGINE LACKS POWER
1. Drive Train Inspection
Raise wheel off the ground and spin by hand.
Does the wheel spin freely?
NO
·
Brake dragging
·
Worn or damaged wheel bearing
·
Damaged differential or final drive bearing
·
Faulty differential or final drive
YES
GO TO STEP 2.
2. Tire Pressure Inspection
Check tire pressure.
Are the tire pressures low?
YES
· Faulty tire valve
· Punctured tire
NO
GO TO STEP 3.
3. Engine Condition Inspection
Accelerate lightly.
Does the engine speed increase?
NO
·
Fuel/air mixture too rich or lean
·
Clogged air cleaner
·
Restricted fuel flow
·
Clogged muffler
·
Restricted fuel tank breather hose
YES
GO TO STEP 4.
4. Engine Condition Inspection
Accelerate or run at high speed.
Is there knocking?
YES
·
Worn piston and cylinder
·
Use of poor quality fuel
·
Excessive carbon build-up in combustion chamber
·
Ignition timing too advance (Faulty ECM)
·
Lean fuel mixture
NO
GO TO STEP 5.
5. Ignition Timing Inspection
Check the ignition timing.
Is the ignition timing correct?
NO
· Faulty engine control module (ECM)
· Faulty ignition pulse generator
YES
GO TO STEP 6.
6. Spark Plug Inspection
Remove and inspect spark plug.
Is the spark plug fouled or discolored?
YES
· Plug not serviced frequently enough
· Incorrect spark plug used
NO
GO TO STEP 7.
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