Honda C8R600F4 Service Manual page 359

TROUBLESHOOTING
From page 23-2
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Possible cause
10. Remove cylinder head cover and - - Valve train not lubricated - - - - •Clogged oil passage
inspect lubrication properly •Clogged oil orifice
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Valve train lubricated properly
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11. Check for engine overheating----- Overheating---------• Coolant level too low
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•Fan motor not working (Faulty fan motor
or fan motor switch)
Not overheating •Thermostat stuck closed
• Excessive carbon build-up in combus-
tion chamber
• Use of poor quality fuel
•Clutch slipping
• Lean fuel mixture
•Wrong type of fuel
12.Accelerate or run at high speed - - - - - Engine knocks--------• Worn piston and cylinder
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•Wrong type of fuel
t •
Exct::ssive 1.;arl.Ju11 l.Juih.l-uµ iri 1.;urnl.Ju::;-
Engine does not knock tion chamber
• Ignition timing too advance (Faulty ICM)
•Lean fuel mixture
POOR PERFORMANCE AT LOW AND IDLE SPEED
Possible cause
1. Check carburetor pilot screw adjust- - - I n c o r r e c t - - - - - - - - - - • See section 5
ment
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Correct
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2. Check for leaking carburetor insulator - - Leaking - - - - - - - - - - • Loose carburetor insulator bands
\ • Damaged carburetor insulator
No leak
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3. Perform spark test - - - - - - - - - Weak or intermittent - - - - - • Faulty spark plug
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spark • Fouled spark plug
• Loose or disconnected ignition system
wires
Good spark
• Faulty ignition pulse generator
• Faulty ignition coil
• Faulty engine stop switch
•Faulty ignition control module (ICM)
• Faulty ignition switch
4. Check ignition t i m i n g - - - - - - - - - Incorrect _ _ _ _ _ _ _ _ __,_• Faulty ignition control module (ICM)
• Faulty ignition pulse generator
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