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2. Electric System
problem
①
Ignition time is late or early
②
Spark is weak or no spark
Adjust ignition time
Check from plug to magneto
3. Air pass problem
①
Leakage on engine
②
Air filter is dirty
③
Cylinder, piston, ring worn out
④
Leakages on connecting face
⑤
Block in exhaust pipe
⑥
Leakage on Air inlet pipe
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 Noise on air valve
①
Gap on valve is too big
Adjust