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Power Unit
35) Correction of Valve Seat
Use valve seat cutter 1 (commercially available item) to
1.
correct valve seat.
2.
Turn 45 degree cutter clockwise to cut valve seat surface
to make it smooth.
Be careful not to over-cut valve seat. Turn valve
seat cutter while pushing down evenly.
3.
Use 30 degree cutter to adjust contact position of valve
seat upper end.
4.
Use 60 degree cutter to adjust contact position of valve
seat lower end.
5-40
1 1
30˚
45˚
45˚
a Carbon build-up or uneven surface.
b
b Width before correction
b Width before correction
60˚
a
30˚
b
60˚
4st 4/5/6 2020
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