Zhejiang Qianjiang Motorcycle RKV 200 Service Manual download pdf (Page 23)

Symptom: Engine lacks power Diagnosis procedures

Yes

Use an ignition timing lamp to check

ignition timing of engine

Lift it with main stand to have the wheels off the ground. Rotate wheels by hands.

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.

Start engine and accelerate gradually and

observe variation of engine RPM.

Engine RPM increases with acceleration.

Engine RPM does not increase 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.

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;.

1. Check CDI

ignitor. 2. Check

magneto flywheel

or trigger coil for

looseness.

Engine lacks power

Wheels rotate freely.

Wheels rotate inflexibly.

Check tire pressure

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.

Air pressure too low

Air pressure normal

Check if valve core leaks

or tyre is broken.

Remove spark plug and block the screwhole of spark plug with a

finger. Press starter button or kick starter pedal.

Finger can feel strong air blasting out

and meantime make a pitpat sound

Finger cannot feel strong air blasting out.

Compression pressure in the cylinder is normal.

Compression pressure in the cylinder is not enough.

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Zhejiang Qianjiang Motorcycle RKV 200 Service Manual Page 23

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