Yamaha ttr230 Service Manual page 22

Model
Exhaust
Head diameter
Face width "B"
Seat width "C"
Edge thickness
External stem diameter
INTAKE
EXHAUST
Internal guide diameter
INTAKE
EXHAUST
Stem – guide clearance
INTAKE
EXHAUST
<Stem warping threshold>
Valve seat width
INTAKE
EXHAUST
Valve springs:
Free length
INTAKE
EXHAUST
Length (valve closed)
INTAKE
EXHAUST
Directions of the turns
(top view)
<Inclination limit>
INTAKE
EXHAUST
MAINTENANCE SPECIFICATIONS
"A"
"D"
28.4~28.6 mm
2.260 mm
0.9~1.1 mm
0.8~1.2 mm
5.975~5.990 mm
5.960~5.975 mm
6.000~6.012 mm
6.000~6.012 mm
0.010~0.037 mm
0.025~0.052 mm
0.010 mm
0.9~1.1 mm
0.9~1.1 mm
Internal spring
36.17 mm
36.17 mm
30.5 mm
30.5 mm
Counterclockwise
<2,5°/1.6 mm>
<2,5°/1.6 mm>
2-5
SPEC
TTR230T
External springs
36.63 mm
36.63 mm
32.0 mm
32.0 mm
Clockwise
<2,5°/1.6 mm>
<2,5°/1.6 mm>