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1. GENERAL INFORMATION ZING125
POOR PERFORMANCE (AT HIGH SPEED)
Inspection/Adjustment Symptom Probable Cause
Check ignition timing
Correct Incorrect Faulty CDI unit
Faulty pulser coil
Check valve clearance
Correct Improperly adjusted valve clearance
Incorrect
Worn valve seat
Check fuel filter for
fuel supply
Fuel flows freely Empty fuel tank
Fuel flow restricted Clogged fuel filter
Clogged fuel tank cap breather
hole
Check carburetor for
clogged jets
Not clogged Clogged Clean and unclog
Check valve timing
Correct Incorrect Cam timing gear aligning marks
not aligned
Check valve spring
tension
Not weakened Weak spring Faulty spring
1-18