Cylinder Head Assembly And Installation - Yamaha TT-R90(N) Owner's Service Manual

CYLINDER HEAD
4. Remove:
Cylinder head
NOTE:
Loosen the bolts and nuts in their proper
loosening sequence.
Start by loosening each bolt and nut 1/2 turn
until all are loose.
ASSEMBLY AND INSTALLATION
1. Install:
Cylinder head
2. Tighten:
Nuts
Bolts
NOTE:
Apply the engine oil on the contact surfaces
of the nuts, bolts and copper washers.
Follow the numerical order shown in the illus-
tration. Tighten the bolts and nuts in two
stages.
3. Install:
Camshaft sprocket 1
Installation steps:
Turn the crankshaft counterclockwise until
the "I" mark a on the rotor is aligned with
the stationary pointer b on the crankcase
cover.
Align the "I" mark c on the camshaft
sprocket with the stationary pointer d on
the cylinder head.
Fit the timing chain 2 onto camshaft
sprocket and install the camshaft sprocket
on the camshaft.
NOTE:
When installing the camshaft sprocket,
keep the timing chain as tense as possible
on the exhaust side.
4 - 11
ENG
22 Nm (2.2 m · kg, 16 ft · lb)
10 Nm (1.0 m · kg, 7.2 ft · lb)