TOHATSU MFS 8B Service Manual page 133
4 stroke
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Also See for MFS 8B:
- Owner's manual (372 pages) ,
- Owner's manual (90 pages) ,
- Owner's manual (88 pages)
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1.
Use valve seat cutter (commercially available item) to
correct valve seat.
Be careful not to over-cut valve seat. Turn valve
seat cutter while pushing down evenly.
2.
Turn 45° degree cutter clockwise to cut valve seat surface to
make it smooth.
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.
4st 8/9.8 2016
Carbon or uneven surface
Contact width before correction
Contact width before correction
5-29
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