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2
. GENERAL INFORMATION
POOR PERFORMANCE (AT HIGH SPEED)
Inspection/Adjustment
Check ignition timing
Check carburetor pilot
screw adjustment
Check fuel pump for
fuel supply
Check carburetor jets
for clogging
Check valve timing
Check valve spring
tension
2-39
Symptom
Correct timing
Correctly adjusted
Fuel flows freely
Not clogged
Correct
Not weakened
Incorrect timing
Incorrectly adjusted
Fuel flow restricted
Clogged
Incorrect
Weak spring
VITALITY 50
Probable Cause
Faulty CDI unit
Faulty pulser coil
The woodruff key in the
crankshaft is not fix position.
Improperly adjusted valve
clearance
Worn valve seat
Empty fuel tank
Clogged fuel tube or filter
Clogged Fuel tank cap breather
hole
Faulty auto fuel valve
Clean and unclog
Cam timing gear aligning marks
not aligned
Faulty spring
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Troubleshooting
