Analysis Of Insufficient Engine Power - ZONGSHEN ZS250GY-3(EFI) Maintenance Manual

The pressure
is too low.
Check whether the valve element
of wheel has leakage and whether
wheel is broken off.
Finger can feel strong gas rush outward.
Meanwhile there is sound of flop,flop.
The compressing pres-
sure is normal.
Start engine and gently turn throttle con-
trol grip inward.Observe the rev change
of engine.
The engine rev will en-
The engine rev won't en-
hance when the gun is
hance when stepping on the
bigger
accelerator.
Check whether engine ignition
is timing.
Yes
① Check whether oil supplying is blocked and
oil pressure value is between 240-250KPa.
② Check whether fuel filter ,air filter and muffler
are blocked.

1.2 Analysis of Insufficient Engine Power

E n g i n e p o w e r i s
insufficient.
Support motorcycle with main stand,make it off the
ground and rotate wheel with hands.
Wheel rotates freely.
Check the pressure
of tire.
The pressure
is normal.
Dismantle spark plug and put your finger on the screw
thread hole of spark plug,then press down the starting
button or rapidly step the starting lever.
[1]Check whether the outer connection of engine has leakage.
[2]Check whether the valve ia timing.
[3]Check whether the valve clearance is too small.
[4]Check whether the seal between valve and valve holder is good.
[5]Check whether piston ring breaks off or is dead or whether its
elasticity is not enough.
[6]Check the abrasion of piston ring and cylinder.
[1]Check whether there is something wrong with CDI.
[2]Check whether the flywheel of generator and trigering
coil are loose.
Wheel rotates hardly.
[1]Check whether brake is dead.
[2]Check whether the axle of wheel is damaged or
worn.
[3]Check whether the insulator between the wheel
Finger cannot feel strong gas rush
outward and the compressing pres-
sure of cylinder is not enough.
The compressing pressure
is not enough.
No
57