Jinan QingQi QM50QT-6 Manual page 44

2.Familiar trouble about the engine and the way of the elimination
Position Trouble
1. The CDI device is bad
2. The pulse apparatus is bad
3. The wire is not linked or the joint is loose.
1. The spark plug is damp
——There is overmuch oil in the carburetor
——The assistant starting device is bad
The engine can
——The throttle valve is over opened
not be started
without measure
——The air filter is dirty
2. The spark plug is blocked by dirt
1. The cylinder head
The pressure is low
Leaks or the sealing ring is damaged
It is difficult to start
The cylinder head bends or is distorted
Cylinder the engine
2. Valve
head/ The working state is
The valve adjustment is abnormal
Valve abnormal when the
The valve is burned-out or bends
engine rotates at a
The valve spring is broken off or the
low speed
springiness is abnormal
Reason The way of eliminating the trouble
1. Replace CDI
2. Replace the pulse apparatus
3. Link all the wires
1.——Release the oil in the carburetor
——Inspect and repair or replace the assistant
starting device
——Adjust the opening limit of the throttle valve
——Clean the air filter
2.Clean out the dirt
1.Replace the sealing ring or the grommet
Replace the cylinder head
2.Adjust the valve gap
The air intake/The air exhaust：0.14mm
Replace the valve
Adjust the valve cam chain
Replace the valve spring
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