KS Motorcycles K-LIGHT125, Maintenance Manual

Page: 210 / 278

Grind the valve seat ring with a 45° finishing cutter to
reach an appropriate width.
Make sure to remove all dents and uneven parts.
Standard valve seat ring width: intake: 1.0mm
exhaust: 1.0mm
If the contacted position is in the too high part of valve,
please lower the valve seat ring with a 32° flat cutter.
If the contacted position is in the too low part of valve,
raise the valve seat ring with a 60° internal cutter.
Use the 45° finishing cutter to finish the valve seat ring
again to make it meet the required specification.
After the valve seat ring is grinded, apply polish to the
valve surface and gently polish the valve.
12.7 Installation of Cylinder Head
Installation shall be carried out in the order contrary to
the disassembly order.
*Note:
When installing the valve spring, install the end of
spring with smaller pitch toward the combustion
chamber.
When installing the valve collet, compress the valve
spring with valve spring compression tool
(QJ153-10-0104/G10) for installation.
When the valve is installed, apply appropriate amount
of engine oil to the surface of the valve stem and then
install the valve stem into the valve guide.
The contact surface is high
The contact surface is low
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