KAYO MOTOR A180, Service Manual

Page: 132 / 213

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4.Cylinder head/valve
Trim the valve seat and clean the cylinder head to
remove any metal debris.
Special tool: valve guide reamer 5mm
Valve seat inspection and repair
Remove all carbon deposits on the intake and
exhaust valve parts.
Apply a thin layer of emery to the contact surface of
the valve valve and the valve seat, and use a special
grinding tool to drive the valve valve to grind each
other.
Remove the valve and check whether the valve
contact surface is tight.
Do not allow emery to enter the valve stem
and conduit.
After running-in, wash away the emery, and
apply a layer of red lead on the contact
The valve can not be repaired and reused. If
the valve surface is rough, worn or incomplete
contact with the valve seat, it must be
replaced. After the contact surface of the valve
and the valve seat is ground, it should be
replaced if it cannot be tightly sealed.
NOTE
NOTE
Valve seat
width