20-3
TROUBLESHOOTING
POOR PERFORMANCE AT LOW AND IDLE SPEEDS
Possible cause
• See section 5
Correct
Not leaking
Normal
4. Check choke valve
5. Check ignition timing Incorrect
Incorrect
1. Check carburetor air screw
adjustment
Good spark
3. Perform spark test Weak or intermittent
spark
Abnormal
• Loose carburetor and/or intake pipe
• Damaged carburetor insulator
• Deteriorated intake pipe O-ring
• Ignition system problem (section 16)
• Faulty choke valve
• Faulty ignition pulse generator
• Faulty ignition control module (ICM)
Leaking2. Check if air is leaking past intake
pipe
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