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1. GENERAL INFORMATION MXU 250R/300R
POOR PERFORMANCE (ESPECIALLY AT IDLE AND LOW SPEEDS)
Inspection/Adjustment Symptom Probable Cause
Check ignition timing
Faulty ignition unit
Correct timing Incorrect timing
Faulty pulser coil
Check carburetor air
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 not securely
No air leak Air leaks tightened
Damaged insulator rubber
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 ignition unit
Weak or inter- Faulty A.C. generator
Good spark mittent spark Faulty ignition coil
Broken or shorted spark plug
wire
Faulty ignition switch
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