TROUBLESHOOTING
POOR PERFORMANCE AT HIGH SPEED
1. Check ignition timing and valve INCORRECT
clearance.
CORRECT
2. Disconnect fuel line at carburetor.
FUEL FLOWS FREELY
FUEL FLOW RESTRICTED
3. Remove carburetor and check for CLOGGED —
clogged jet(s). (Clean them)
NOT CLOGGED
4. Check valve timing. INCORRECT -
CORRECT
5. Check valve spring tension. WEAK
NOT WEAKENED
6. Check spark arrester for clogging.
Probable Cause
Improper valve clearance
Faulty CDI unit
Faulty pulse generator
Clogged fuel tube
Clogged fuel tank breather tube
Clogged fuel valve
Clogged fuel strainer
Loose air cleaner connecting tube
Faulty air cleaner
Camshaft not installed properly
•• • Faulty spring
21-4
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