Yamaha TTR90 Fahrer- Und Wartungshandbuch Seite 216

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)