Engine middle
and high
rotate speed is
uneven
Mechanical
problem
① The force of Valve spring is
weak.
② Cam axle worn out
③ Plug is dirty.
④ Gap of plug is too small.
⑤ Air circulation is not right.
⑥ Ignition loop problem
⑦ Floater of carburetor is too
lower.
⑧ Air filter is dirty.
⑨ Block in fuel pipe cause fuel
supply problem
⑩ Fuel pipe problem
Change
Change
Clean or Change
Adjust or change
Adjust or change
Change
Adjust the height of floater
Clean or change
Clean
Change
Exhaust blue
smoke
Mechanical fault ① too many lube
② Piston ring worn out
③ Val ve pi pe wo rn ou t
④ Cylinder wall scratched
⑤ Valve rod worn out
⑥ Seal of valve rod broken
Drain the extra lube
Change
Change
Change
Change
Change
1. Fuel supply
system fault
① Jam in muzzle of carburetor
② Level of Floater not correct
③ Air filter is dirty
④ Leakage on air intake pipe
⑤ Too many lube
Clean or change
Adjust the height of floater
Clean or change
Tighten or change
Drain the extra lube
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