TOHATSU MFS 2 Service Manual

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4st 2/2.5/3.5 2007
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34) Inspection of Valve Seat
1. Remove carbon built up on the valve.
2. Apply thin coat of red lead on the valve seat.
3. Use valve lapper 1 (commercially available item) as
shown to push valve 2 onto valve seat lightly.
4. Measure width of area where valve face contacted with
valve seat a that can be identified with red lead adhered
to valve face. Correct valve seat if contact area is above or
below the center or contact area of valve seat is over
specified limit.
Valve Seat Contact Width a : Standard value
Intake and Exhaust Sides : 1.0 mm (0.04 in)
Functional Limit :
Intake and Exhaust Sides : 2.0 mm (0.08 in)
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TOHATSU MFS 2 Specifications

General

Brand	TOHATSU
Model	MFS 2
Category	Engine
Language	English