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Remove 1/4 of external edge of valve race with a
30° angle milling cutter.
Remove 1/4 of bottom of valve race with a 70°
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: 0.9mm
Exhaust: 1.0mm
30°
45°
0.9mm
70°
1mm
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