Yamaha TTR90(M), Owner'S Service Manual

Page: 126 / 287

3 - 9
INSP
ADJ
VALVE CLEARANCE ADJUSTMENT
4. Check:
●
Valve clearance
Out of specification
→
Adjust.
5. Adjust:
●
Valve clearance
Valve clearance (cold):
Intake valve:
0.05 ~ 0.09 mm
(0.0020 ~ 0.0035 in)
Exhaust valve:
0.08 ~ 0.12 mm
(0.031 ~ 0.047 in)
Checking steps:
●
Turn the crankshaft counterclockwise with
a wrench.
●
Align the T.D.C. mark
a
on the rotor with
the align mark
b
on the crankcase cover
when piston is at T.D.C. on compression
stroke.
●
Measure the valve clearance using a
feeler gauge
1 .
Out of specification
→
Adjust clearance.
Adjustment steps:
●
Loosen the locknut 1 .
●
Turn the adjuster 3 in or out with the
valve adjusting tool 2 until specified clear-
ance is obtained.
Turning in
→
Valve clearance is decreased.
Turning out
→
Valve clearance is increased.
Valve adjusting tool:
YM-08035/90890-01311
●
Hold the adjuster to prevent it from moving
and tighten the locknut.
●
Measure the valve clearance.
●
If the clearance is incorrect, repeat above
steps until specified clearance is obtained.
1
1
2 3
T
R .
.
7 Nm (0.7 m · kg, 5.1 ft · lb)