ZHEJIANG KAYO MOTOR CO., LTD.
highest-pressure value of the engine cylinder.
Standard
1200~1250Pa
Minimum
1100Pa
Low pressure indicates the following faults:
Excessive wear of the cylinder wall.
The piston or piston ring is worn.
The piston ring is stuck in the ring groove. The valve is not properly engaged with the valve
seat.
The cylinder head gasket is damaged. When the engine compression pressure is lower than
the above limit value, the engine should be reinstalled, inspected and repaired according to
the specific conditions.
NOTE
: Before testing the compression pressure of the engine, make sure that the cylinder head
nuts and bolts are tightened according to the specified torque and the valve clearance is adjusted
correctly.
THE ENGINE ADJUSTMENT
IDLE SPEED ADJUSTMENT OF CARBURETOR
Throttle screw
Air screw
The idle speed of the carburetor can be adjusted
through the throttle screw and air screw.
Proceed as follows:
1. Rotate the air screw clockwise until it reaches the
top of its stroke, and then reverse one and a quarter
of a turn;
2. Adjust the throttle screw to ensure that the engine
can run at a certain speed when the throttle lever is
completely loosened;
3. Adjust the throttle screw to reduce the engine
speed as much as possible;
4. Adjust the air screw to increase the engine speed as
much as possible;
5. Repeat the above steps until a satisfactory speed is
obtained;
6.
Check whether the throttle cable is working
properly.
DANGER
: Driving a motorcycle with a damaged
throttle cable is undoubtedly a very dangerous
behavior. The normal throttle cable should have a free
stroke of at least 10mm. Start the engine and turn the
handlebar left and right. If the engine stalls or
accelerates due to the movement of the handlebar, the
throttle cable may be improperly adjusted or damaged.
Make sure that the throttle cable is normal before
driving the motorcycle.
CLEAN THE CARBURETOR
The carburetor will leave a portion of fuel after every
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