Valve Race Fixing And Adjustment - KEEWAY RKV125 Instruction And Maintenance Manual

12.6 Valve Race Fixing and Adjustment

Remove hackly and ragged parts on the valve race with a 45°
angled milling cutter.
Note：
Apply a layer of transparent or Prussian blue film onto the
valve race so that it can be observed clearly.
Remove 1/4 of external edge of valve race with a 32° angle
milling cutter.
Remove 1/4 of bottom of valve race with a 60° angle milling
cutter.
Remove the milling cutter and check the places processed.
Grind and cut valve race with a 45° angle precise milling cutter
till it gains a proper width.
All the dents and ragged parts must be removed.
Standard valve race width: Intake: 1.0mm
Exhaust: 1.0mm
Hackly part
32°
60°
1mm
45°