Honda SH300I 2006, Manual

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TROUBLESHOOTING
25-3
ENGINE LACKS POWER
1. Engine Oil Inspection
Check the oil level and condition.
Is the oil level correct and the oil in good condition?
YES – GO TO STEP 2.
NO – • Oil level too high
• Oil level too low
• Contaminated oil
2. Wheel Inspection
Raise the rear wheel off the ground and spin it by hand.
Does the wheel spin freely?
YES – GO TO STEP 3.
NO – • Brake dragging
• Worn or damaged final reduction and driven pulley bearings
• Bent final gear shaft
3. Tire Pressure Inspection
Check the tire pressure.
Is the tire pressure correct?
YES – GO TO STEP 4.
NO – • Faulty tire valve
• Punctured tire
4. Spark Plug Inspection
Remove and inspect the spark plug.
Is spark plug in good condition?
YES – GO TO STEP 5.
NO – • Plug not serviced frequently enough
• Incorrect spark plug heat range
• Incorrect spark plug gap
• Dirty air cleaner element
5. Ignition Timing Inspection
Check the ignition timing.
Is the ignition timing correct?
YES – GO TO STEP 6.
NO – • Faulty ECM
• Faulty CKP sensor
• Improper valve timing
6. Cylinder compression Inspection
Test the cylinder compression.
Is the compression within specification?
YES – GO TO STEP 7.
NO – • Valve stuck open
• Worn cylinder and piston rings
• Damaged cylinder head gasket
• Seized valve
• Incorrect valve seat contact
• Improper valve timing