Chapter 2 Periodic maintenance Section 3 Inspection of compression pressure
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Section 3 Inspection of compression
pressure
The compression pressure reading is displayed with
the built-in indicator. It usually judges if the cylinder needs
heavy maintenance based on the results of the compression
pressure test. The maintenance records kept at the
distributor include the compression pressure data of each
maintenance.
Compression pressure technical specification
Low compression pressure may indicate any of the
following conditions:
The cylinder wall is over worn;
Piston or piston ring is worn;
Piston ring is stuck in the groove;
The valve seat is not well;
Cylinder cap gasket is defected with crack.
Compression test procedure
Note：
Before testing the engine compression pressure, it
must need to check whether the cylinder cap nut is
tightened to the specified torque and whether the valve is
adjusted properly.
Before the test, it needs to warm up the engine.
It needs to make sure that the battery is fully
charged.
Remove the relevant components, and test the
compression pressure according to the following method:
Install the pressure gauge and adapter in the spark plug
hole to make sure that the connection is tight.
As in Fig.2.3.1
Fully open the throttle handle.
Press the start button and rotate the engine for a few
seconds, then record the maximum reading of the cylinder
compression pressure.
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