Symptom: 4-stroke engine exhaust muffler gives off blue-white smoke Diagnosis procedures
Symptom: Incomplete separation of clutch Diagnosis procedures
Incomplete separation of clutch
Check if clearance of clutch handle bar is within
10mm-20mm.
Re-adjust
Check if adjusting screw for clutch push rod is properly adjusted
Re-adjust
Check if elasticity of clutch spring is even.
Replace the whole set of clutch
spring.
Check if splines on clutch active and drive hubs are worn into zigzag form
Repair or replace
1. Check if clutch driven plate is warping and distorted;
2. Check if separation cam shaft, separation push rod and other
components of clutch control mechanism are excessively worn.
No
No
No
No
Yes
Yes
Yes
Yes
4-stroke engine exhaust muffler gives off blue-white smoke
Check if engine oil level in the crankcase exceeds the upper limit line
Too much engine oil in the crankcase, bleed surplus oil
and decline oil level to upper limit line.
1. Check if cylinder, piston or
piston ring is over worn; 2.
Check if elasticity of piston ring
is not enough or stuck in the ring
groove; 3. Check if openings of
piston ring are staggered with
each other.
Check if clearance between valve
and valve guide is too big.
Check if valve or valve guide is over worn.
Valve oil seal is
damaged.
Yes
Yes
Yes
No
No
No
Start engine and run it at high speed; screw off
oil ruler and check if oil filler smokes.