Engine Lacks Power - Honda Metropolitan CHF50 Service Manual

TROUBLESHOOTING
ENGINE LACKS POWER
1. Drive Train Inspection
Raise the front wheel off the ground and spin it by hand.
Does the wheel spin freely?
NO - • Brake dragging
• Worn or damaged wheel bearings
• Bent axle
YES - GO TO STEP 2.
2. Tire Pressure Inspection
Check the tire pressure.
Is the tire pressure correct?
NO - • Faulty tire valve
• Punctured tire
YES - GO TO STEP 3.
3. Clutch Inspection
Accelerate rapidly.
Does the engine speed change accordingly?
NO - • Clutch slipping
• Worn clutch shoes/outer
• Weak driven face spring
• Additive in engine oil
• Weight roller stuck
YES - GO TO STEP 4.
4. Engine Performance Inspection
Accelerate lightly.
Does the engine speed increase?
NO - • Faulty starting enrichment (SE) valve
Clogged air cleaner
Restricted fuel flow
Clogged muffler
Clogged fuel cap breather
Faulty fuel pump
YES - GO TO STEP 5.
5. Spark Plug Inspection
Remove and inspect the spark plug.
Is the spark plug in good condition?
NO - • Plug not serviced frequently enough
• Incorrect spark plug heat range
• Incorrect spark plug gap
YES - GO TO STEP 6.
6. Engine Oil Inspection
Check the oil level and condition.
Is the engine oil in good condition?
NO - • Oil level too high
• Oil level too low
• Contaminated oil
YES - GO TO STEP 7.
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