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2. GENERAL INFORMATION VITALITY 50
POOR PERFORMANCE (ESPECIALLY AT IDLE AND LOW SPEEDS)
Inspection/Adjustment Symptom Probable Cause
Check ignition timing
Faulty CDI unit
Correct timing Incorrect timing
Faulty pulser coil
The woodruff key in the
Check carburetor pilot crankshaft is not fixed position.
screw adjustment
Mixture too rich (turn screw
Correctly adjusted Incorrectly adjusted out)
Mixture too lean (turn screw in)
Check carburetor gasket
for air leaks
Deteriorated O-ring
Carburetor is not securely
No air leak Air leaks tightened
Damaged insulator rubber
Broken vacuum tube
Remove spark plug and
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 spark plug
wire
Faulty ignition switch
Check air cut-off valve
Faulty air cut-off valve
Good Faulty Damaged vacuum tube
Clogged or damaged air vent
hole
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