3. Air pass problem ① Air mixture is too thick or thin
② Leakage on engine
③ Air filter is dirty
④ Cylinder, piston, ring worn out
⑤ Leakages on connecting face
⑥ Block in exhaust pipe
⑦ Leakage on Air inlet pipe
Adjust carburetor
Repair
Clean or change filter
Repair or change
Repair or change
Dredge
Repair or change
4. Engine cooling
system
① Block in water channel or radiator
② Air in Cooling system or coolant is
not enough
③ Water pump problem
④ Unsuitable coolant
⑤ Constant temperature unit problem
⑥ Fault on motor of fan or switch of
heat-sensor
Clear
Release air, refill
coolant
Change
Change
Change
Change
5. Miscellaneous ① Carbon accumulated on top of
piston
② Too many or less lube
③ Unsuitable lube used
Clear
Drain or Refill
Change
Noise from
engine
Noise on air valve ① Gap on valve is too big
② Spring on valve is broken
③ Swing arm or cam shaft worn out
Adjust
Change
Change
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