CF MOTO CF500-5, Service Manual, Page: 71 / 254

3-24
CFMOTO
Inspection of cylinder pressure
Check cylinder pressure is necessary.
Cylinder Pressure: 1000kpa
A lower cylinder pressure may be caused by:
-Excessive wear of cylinder;
-Wear of piston or piston ring;
-Piston ring jam in groove;
-Poor closure of valve seat;
-Damaged cylinder gasket or other defects
Note
: When cylinder pressure too low, check the
above items.
Testing Cylinder Pressure
Note: Before testing of cylinder pressure, make sure
that cylinder head bolts are tightened to the specified
torque and valve clearance has been properly adjusted.
-Warm up the engine before testing;
-Make sure battery is fully charged;
-Remove spark plug 1;
-Install cylinder pressure gauge 2 in spark plug hole
and tighten nut;
-Keep throttle full open;
-Press start button crank the engine a few seconds.
Record the maximum reading of cylinder pressure.
Tools: Cylinder Pressure Gauge
Adaptor