Yamaha TT-R90E, Owner'S Service Manual

Page: 194 / 340

4 - 12
ENG
CYLINDER HEAD
CAUTION:
.
Do not turn the crankshaft during instal-
lation of the camshaft. Damage or
improper valve timing will result.
●
Remove the safety wire from the timing
chain.
4. Install:
●
Washer
●
Bolt 1
NOTE:
Install the bolt 1 while holding the rotor nut
with a wrench.
T
R
.
.
20 Nm (2.0 m · kg, 14 ft · lb)
5. Install:
●
Timing chain tensioner
6. Check:
●
Rotor “I” mark
Align with the crankcase stationary
pointer.
●
Valve clearance
Out of specification
→
Adjust.
Refer to the “VALVE CLEARANCE
ADJUSTMENT” section in CHAPTER 3.
Installation steps:
●
Remove the tensioner cap bolt 1 and
spring 2 .
●
Release the timing chain tensioner one-
way cam
3 and push the tensioner rod 4
all the way in.
●
Install the tensioner with a new gasket 5
onto the cylinder.
T
R
.
.
Timing chain tensioner bolt:
10 Nm (1.0 m • kg, 7.2 ft • lb)
●
Install the spring 2 and cap bolt 1 .
●
Tighten the bolt (with gasket) to the speci-
fied torque.
T
R
.
.
Cap bolt:
8 Nm (0.8 m • kg, 5.8 ft • lb)