Jinan QingQi QM50QT-6 Manual page 46

4.Familiar trouble about the engine and way of the elimination
Position Trouble
The cylinder
head and the 1.There is overmuch carbon deposit on the piston or in
cylinder body are the firebox
over hot
1. The piston pin hole and the piston pin are fretted
2. The bearing in the small end of the lever is worn
3. The bearing in the big end of the lever is worn
The noise is
4. The shaft bends
larger
5. The main shaft bearing is worn
6. The rotating part of the engine is short of oil
7. The cam shaft or the shaft slipcover is worn
Crank
shaft/
Crank
The power is 1. The spark plug is bad
shaft box
lack for a while 2. The engine is over hot
1. the oil route is not expedite
The power is
2. The mix rate is impropriety
lack for a long
3. Stack carbon in the cylinder and the exhaust tube
time
4. The piston（ring）and the cylinder are worn
Reason The eliminating the trouble
1.Clean out the carbon deposit
1. Replace the piston and the pin
2. Replace the bearing
3. Replace the bearing
4. Replace the crank shaft
5. Replace the bearing
6. Replenish the oil
7. Replace the camshaft or the bushing
1. Replace the spark plug
2. Cool the engine and avoid running for a
long time
1. Dredge the oil route
2. Adjust
3. Clean out the carbon deposit
4. Replace the cylinder and the piston（ring）
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