KS Motorcycles K-LIGHT125, Maintenance Manual

Page: 209 / 278

Clean the carbon deposits in the combustion chamber
and valve, and thoroughly rinse the intake and exhaust
valves.
Check the width of valve seat contact surface (width of
valve seat ring).
Allowable limit: intake /exhaust: 1.6mm
12.6 Finishing Valve Seat Ring
Use a 45°cutter to remove the rough or uneven parts on
the surface of valve seat ring.
*Note:
Apply a layer of transparent or Prussia blue coating to
the valve seat ring.
so that it can be seen more clearly.
Remove 1/4 of outer end of valve seat ring with a 32°
cutter.
Remove 1/4 of bottom end of valve seat ring with a 60°
cutter.
Remove the cutter, and check the places that have
been handled.
Valve seat contact
surface
Rough position
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