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Rotation unsmooth (especially in low speed)
Fault Diagnosis Adjustment Check Fault Cause
Normal Abnormal
Ignition time
adjustment
Adjust well Adjust not well
Air damper restriction
screw adjustment
No air in Air in
Disassemble spark plug
to check the flashover
Spark plug
flashover
well
Spark plug
flashover not well
Not well
Well
Air into shim
Unhealthy CDI group
Unhealthy trigger
Gas mixture is too thin (loosen bolt)
Gas mixture is too strong (tighten bolt)
Heat filter not well
Loose restrictor fixed nut
Broken shim
Broken negative pressure pipe
Spark plug not well or polluted
CDI not well
Ignition coil not well
Spark plug guide line open circuit or
short circuit
Master switch not well
Negative pressure pipeline damage
Air circulation hole blocked
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