90
Engine
coolant
temperature is
lower
Cooling System ① Fault on heat sensor switch on fan
② Cold weather
③ problem on constant temperature
meter
Change
Cover the radiator
Change
Spark weak Ignition System ① Fault on starter
② problem on spark plug
③ Magneto problem
④ Voltage of battery is weak
⑤ Ignition loop problem
⑥ Starting loop problem
Change
Change
Change
Change
Change
Change
（II）Malfunction in transmission system
Vehicle speed
does not
increase by
engine speed
Transmission
system
①Shift belt slips
②Speed adjusting plate abrasion is too
much
③Speeding adjusting plate slipping is
blocked
④Spring force of adjuster is short
Change
Change
Repair or Change
Repair or Change
Out of gear Gear Box or Gear
shifting system
① Speed changing drum groove
worn out
Change
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