KYMCO Active 50 Service Manual page 22

1
. GENERAL INFORMATION
ACTIVE 50
POOR PERFORMANCE (AT HIGH SPEED)
Inspection/Adjustment Symptom Probable Cause
Check ignition timing
Faulty CDI unit
Correct
Incorrect
Faulty pulser coil
Check valve clearance
Improperly adjusted valve clearance
Correct Incorrec
Worn valve seat
filter
Check fuel for
fuel supply
Empty fuel tank
freely
Fuel flows
Fuel flow restricted
Clogged fuel filter or tube
Clogged fuel tank cap breather
hole
Cracked fuel pump vacuum tube
Check carburetor for
clogged jets
Not clogged Clogged
Clean and unclog
Check valve timing
Cam timing gear aligning marks
Correct Incorrect
not aligned
Check valve spring
tension
Not weakened Weak spring
Faulty spring
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