KAYO MOTOR AU200, Maintenance Manual, Page: 80 / 138

5
发动机
5- 24
On the cylinder head, press the new valve
guide and the
“
O
”
ring. Then reaming the
newly installed valve guide
Note: When reaming, apply cutting oil to
the reamer. Rotate when loading or
unloading the reamer.
Finally, the cylinder head is cleaned with a
cleaning agent and all the metal chips
accumulated on the cylinder head are
removed with compressed air.
5.5.14 Valve seat inspection and
grinding
First, remove the dust on the intake and
exhaust valves.
Apply abrasive to the valve seat
Then use the grinding tool of the rubber
head to suck the valve
Grinding the valve seat.
Remove the valve and check the valve,
the width of the contact surface
Standard value: 1.2~1.6mm
Maintenance limit
：
2.0mm
Note: If the valve contact surface is rough,
uneven wear or improper contact with the
valve seat, the valve should be replaced.
Combustion Chamber
valve