gio Vyper 4WD 1100cc 2 seater Owner's Manual page 93

Engine middle Mechanical
and high problem
rotate speed is
uneven
Exhaust blue Mechanical fault
smoke
1. Fuel supply
system fault
⑤ Magneto 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 Air filter is dirty.
⑧ Block in fuel pipe cause fuel
supply problem
⑨ Fuel pipe problem
⑩ Underpressure in hight-pressure
fuel pump
① too many lube
② Piston ring worn out
③ Valve pipe worn out
④ Cylinder wall scratched
⑤ Valve rod worn out
⑥ Seal of valve rod broken
① Blocked in muzzle of throttle
body
② Air filter is dirty
③ Leakage on air intake pipe
85
Change
Change
Change
Clean or Change
Adjust or change
Adjust or change
Change
Clean or change
Clean
Change
Adjust or change
Drain the extra lube
Change
Change
Change
Change
Change
Clean or change
Clean or change
Tighten or change
Drain the extra lube