Engine Lacks Power - Honda TRX450R Service Manual

2004-2009
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TROUBLESHOOTING
ENGINE LACKS POWER
1. Drive Train Inspection
Raise wheel off the ground and spin it by hand.
Does the wheel spin freely?
YES
- GO TO STEP 2.
NO
- • Brake dragging
• Worn or damaged wheel hub or axle bearing
• Drive chain too tight
2. Tire Pressure Inspection
Check tire pressure.
Are the tire pressures low?
YES
- • Faulty tire valve
• Punctured tire
NO
- GO TO STEP 3.
3. Clutch Inspection
Accelerate rapidly from low to second.
Does the engine speed change accordingly when clutch is engaged?
YES
- GO TO STEP 4.
NO
- • Clutch slipping
• Worn clutch discs
• Warped clutch plates
• Weak clutch springs
• Damaged clutch lifter arm
• Additive in engine oil
4. Engine Condition Inspection
Accelerate lightly.
Does the engine speed increase?
YES
- GO TO STEP 5.
NO
- • Starting enrichment (SE) valve stuck open ('04 - '05)
• Carburetor choke is on (After '05)
Fuel/air mixture too rich or lean
Clogged air cleaner
Restricted fuel flow
'
Clogged muffler
Restricted fuel fill cap breather hose
Excessive carbon build-up in combustion chamber
5. 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 ignition control module (ICM) or ignition pulse
generator)
• Lean fuel mixture
NO
- GO TO STEP 6.
6. Ignition Timing Inspection
Check the ignition timing.
Is the ignition timing correct?
YES
- GO TO STEP 7.
NO
- • Faulty ICM
• Faulty ignition pulse generator
26-4

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