Cylinder/piston/piston pin
wear off badly
Replace or repair
Piston ring& edge wear
Off badly
Replace
Excessive valve clearance
Thrust half-ring wear off
badly
Replace
6 Excessive oil
consumption
Worn oil sealing of valve
pipe
Replace
Piston pin spring is weak or
the opening is not be cross
Replace or adjust
Air vent system of crankcase
plugged
purge
7 Insufficient oil
pressure
Insufficient or excessive oil
·
Oil pressure senor is
defective
Replace
8 Blow of exhaust
pipe
Exhaust valve is not sealed
Spark too late
adjust angle of spark and
then check cylinder pressure
9 No idle speed
accumulated
carbon/clearance the spark
plug is improper
Adjust
Spark timing is too early
Throttle valve is defective
Adjust/replace air throttle
positioning
change it ,
adjust idle
stepper motor plug or
replace