Honda CBF150 2002 Manual page 331

TROUBLESHOOTING
7. Engine Oil Inspection
Check oil level and condition.
Is there correct level and good condition?
NO
YES
8. Spark Plug Inspection
Remove and inspect spark plug.
Is the spark plug fouled or discolored?
NO
YES
9. Cylinder compression Inspection
Test the cylinder compression.
Is the compression low?
YES
NO
10. Carburetor Inspection
Check carburetor for clogging.
Is the carburetor for clogged?
YES
NO
11. Lubrication Inspection
Remove cylinder head cover and inspect lubrication.
Is the valve train lubricated properly?
NO
19-4
– • Oil level too high
• Oil level too low
• Contaminated oil
– GO TO STEP 8.
– • Plugs not serviced frequently enough
• Incorrect spark plug used
• Incorrect spark plug gap
– GO TO STEP 9.
– • Valve clearance too small
• Valve stuck open
• Worn cylinder and piston rings
• Damaged head gasket
• Improper valve timing
– GO TO STEP 10.
– Carburetor not serviced frequently enough.
– GO TO STEP 11.
– • Clogged oil passage
• Clogged oil strainer