Engine Lacks Power - Honda MUV700 big red Service Manual

ENGINE LACKS POWER
1. Drivetrain 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 fina l drive bearing
• Faulty differential or final drive
YES - GO TO STEP 2.
2. Tire Pressure Inspection
Check ti re pressure.
Are the tire pressures correct?
NO _ . Faulty tire valve
• Punctured tire
YES - GO TO STEP 3.
3. Engine Condition Inspection
Accelerate lightly.
Does the engine speed increase?
NO - . Clogged air cleaner
• Restricted fuel flow
• Clogged muffler
• Restricted fuel tank breather
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 PCM )
NO - GO TO STEP 7.
5. 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 6.
6. Engine Oil Inspection
Check oil level and condition.
Is there correct level Bnd good condition ?
NO - . Oil level too high
• Oil level too low
• Contaminated oil
YES - GO TO STEP 7.
7. Ignition Timing Inspection
Check the ignition timing.
Is the ignition timing correct?
NO - . Faulty PCM
• Faulty CKP sensor
YES - GO TO STEP 8.
TROUBLESHOOTING
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