Zhejiang Qianjiang Motorcycle RKV 200 Service Manual page 23

Symptom: Engine lacks power
Lift it with main stand to have the wheels off the ground. Rotate wheels by hands.
Wheels rotate freely.
Check tire pressure
Air pressure too low
Check if valve core leaks
or tyre is broken.
Finger can feel strong air blasting out
and meantime make a pitpat sound
Compression pressure in the cylinder is normal.
Start engine and accelerate gradually and
observe variation of engine RPM.
Engine RPM increases with acceleration
1. Check if clutch slips; 2. Check if
transmission belt is excessively worn; 3.
Check if the centrifugal roller of driving wheel
is excessively worn; 4. Check if conical
surfaces of driving wheel and mobile friction
wheel is excessively worn or worn to groove;
5. Check if conical surface of driven wheel
and mobile driven wheel are excessively worn
or worn to groove; 6. Check if raceway on the
inner end face of friction wheel is excessively
worn or pitted due to crush.
Diagnosis procedures
Engine lacks power
Air pressure normal
Remove spark plug and block the screwhole of spark plug with a
finger. Press starter button or kick starter pedal.
. Engine RPM does not increase with acceleration.
Use an ignition timing lamp to check
ignition timing of engine
1. Check if fuel supply system is smooth;
2. Check if carburetor, air cleaner and
exhaust muffler are clogged; 3. Check if
vacuum diaphragm of plunger valve on
carburetor is cracked or broken;.
23
Wheels rotate inflexibly.
1. Check braking drag; 2. Check if
bearing of wheels are over worn or
injured; 3. Check if the middle spacers in
the hub are missed or a little shorter.
Finger cannot feel strong air blasting out.
Compression pressure in the cylinder is not enough.
Yes
1. Check leakage at external
connection parts of engine;
2.Check valve timing; 3. Check if
valve clearance is too small; 4.
Check tightness between valve
and valve seat; 5.Check if piston
ring is broken or stuck inside the
ring groove or of less elasticity; 6.
Check wear and tear of piston ring
and cylinder.
No
1. Check CDI
ignitor. 2. Check
magneto flywheel
or trigger coil for
looseness.