YAMAHA TT600R Service Manual
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Brand: Yamaha
Category: Bicycle , Motorcycle
Type: Service manual
Model: Yamaha 2004 TT600RE , Yamaha TT600R
Pages: 380
ENG
INSPECTION AND REPAIR
5-25
Mill the valve seat as follows:
Section Cutter
A30°
B45°
C60°
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Valve seat faults recorded by analysing the
valve seal surface:
[A] If the valve surface resembles that shown in
the figure, this means that the valve seat is
centred on the surface but is too wide.
Intervention
Desired effect
on the valve seat
Cutter
30°
Reduce valve seat
type:
60°
width to 1.0 mm
Intervention
Desired effect
on the valve seat
Cutter
30° (before)
Centring of seat and
type:
attainment of 1.0 mm
45° width
Intervention
Desired effect
on the valve seat
Cutter
60° (first)
Centring of seat and
type:
attainment of 1.0 mm
45° width
Intervention
Desired effect
on the valve seat
Cutter
Centring of seat and
type:
45° attainment of 1.0 mm
width
[B] If the valve surface is like this, it means that
the valve seat is centred on the valve surface
but is too narrow.
[C] If the valve surface is like this, it means that
the valve seat is too narrow and close to the
edge of the valve.
[D] If the valve surface is like this, it means that
the valve seat is too narrow and situated low
down near the lower edge of the valve sur-
face.