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Engine Ooes Not Knock
Good Spark
Possible Cause
11. Check for engine overheating -
Overheating
----------~-.
•
Excessive Carbon Built-up in Corn-
bustion chamber
Use of poor quality fuel
Clutch slipping
Lean fuel mixture
Wrongtype of fuel
12. Accelerate orrun at high speed ---- Engine Knocks - - - - - - - - - - . - . . .
Worn piston aridcylinder
•
Wrong tvpe of fuel
Excessive Carbon Built-up in Corn-
bustion chamber
•
Ignition timi"ng too advanced
(Faulty COI unit]
• . Lean fuel mixture
Poor
Performance at Low and Idle Speeds
Possible Cause
1. Check ignition timing
-~------4.~
Incorrect - - - - - - - - - ' - - - - - _ " •
Improper ignítion timing
(Faulty COI unit)
Correct
t
2. Check carburetor pilot
screw---"~ Incorrect------------...,"~·
See page section 5
adjustment
Correct
t
3. Check for leaking intake pipe - - _ . - Leaking - - - - - - - - - - - - -.. ".
Loose carburetor mounting nut
•
Oamaged insulator
No Leak
r
4. Perform spark test - - - - - - - - . Weak or Intermittent ---'---'--.........
Faulty carbonor wet fouled spark
Spark
plug
•
Faulty COI unit
Faulty ignition coil
•
Broken or shorted spark plug wire
Faulty engine stop switch
Faulty pulse generator
Faulty exciter coil
Faulty ignition switch
Loose or disconnected ignition
system wires
18-3
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