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Warning:
Before opening the radiator cap, make
sure that the engine and radiator are
completely cooled, otherwise it may cause
the coolant to spray out and cause serious
scald.
Start the engine at idle speed.
Carefully listen to the engine running
sound, if the timing chain has a relatively
crisp "click" sound, it means that the chain
tension is insufficient, so the chain tension
shall be replaced.
Replacement method:
Loosen 2-M6 × 25 inner hexagon screw,
remove the sealing washer, remove the old
chain tensioner. Be careful not to drop the
sealing gasket, etc. into the crankcase.
Insert the locking key of the tensioner into
Remove the spark plug and test the
cylinder pressure
The main reasons for low cylinder
pressure are as follows:
Incorrect valve clearance adjustment
Valve leakage
Cylinder head seal washer ablation
Worn piston rings or cylinders
The piston is worn
The main reasons for high compression
force are as follows
There is carbon deposit on the top of
combustor or piston
3. Remove the air filter cover and air filter
element
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