Jinan QingQi QM50QT-6 Manual page 45

3.Familiar trouble about the engine and way of the elimination
Position Trouble Reason
1.There is overmuch carbon deposit on the
The pressure is over high
cylinder head or on the top of the piston
1. The valve gap is abnormal
2. The valve is blocked or the valve spring is
3. The cam chain is over loose or is worn
The noise is larger
4. The adjuster is worn or is damaged
5. The cam chain is worn
6. The bracket crankcase or the shaft is worn
7. The cylinder or the piston is damaged
The pressure is low or the
1. The cylinder or the piston is worn
pressure is not stable
1. The cylinder、the piston or the piston ring is
Cylinde
r/Piston
Much smoke from the 2. The piston ring is installed improperly
exhaust pipe
3. The piston or the wall of the cylinder is
The valve lever or the valve pipe is worn
broken off
worn
lacerated or worn
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The eliminating the trouble
1.Clean out the overmuch carbon
deposit
1. Adjust the valve gap
2. Replace the valve spring
3. Adjust the elasticity apparatus or
replace the chain
4. Replace the elasticity cam
5. Replace the cam chain
6. Replace the bracket crankcase or the
shaft
7. Inspect the cylinder and the piston
1. Replace the cylinder or the piston
1. Replace the cylinder、 the piston or the
piston ring
2. Reinstall the piston ring
3. Replace the piston and the cylinder
Replace the valve or the valve pipe