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1. GENERAL INFORMATION GRAND DINK 125/150
POOR PERFORMANCE (ESPECIALLY AT IDLE AND LOW SPEEDS)
Inspection/Adjustment Symptom Probable Cause
Check ignition timing
Faulty CDI unit
Correct timing Incorrect timing
Faulty A.C. generator
Check carburetor pilot
screw adjustment
Mixture too rich (turn screw
Correctly adjusted Incorrectly adjusted out)
Mixture too lean (turn screw
in)
Check carburetor gasket
for air leaks
Damaged insulator rubber
No air leak Air leaks Carburetor not securely
tightened
Faulty intake manifold gasket
Remove spark plug and Deformed carburetor O-ring
install it into spark plug
cap to test spark by
connecting it to engine
ground
Faulty or fouled spark plug
Faulty CDI unit
Weak or inter- Faulty A.C. generator
Good spark mittent spark Faulty ignition coil
Broken or shorted high
tension wire
Check carburetor air Faulty ignition switch
cut-off valve
Damaged air cut-off valve
Good Faulty diaphragm
Damaged air cut-off valve
spring
1-20