Yamaha TT-R90(V), Owner'S Service Manual

Page: 214 / 390

4 - 10
ENG
CYLINDER HEAD
REMOVAL POINTS
Cylinder head
1. Align:
• “I” mark
(with stationary pointer)
Checking steps:
• Turn the crankshaft counterclockwise with
a wrench.
• Align the “I” mark
a
on the rotor with the
stationary pointer
b
on the crankcase
cover. When the “I” mark is aligned with
the stationary pointer, the piston is at the
Top Dead Center (T.D.C.).
NOTE:
• In order to be sure that the piston is at Top
Dead Center, the match mark
c
on the
camshaft sprocket must align with the sta-
tionary pointer
d
on the cylinder head as
shown in the illustration.
• If there is no valve clearance, rotate the
crankshaft counterclockwise one turn.
2. Loosen:
• Camshaft sprocket bolt
1
3. Remove:
• Timing chain tensioner
• Camshaft sprocket
2
NOTE:
• Fasten a safety wire to the timing chain
3
to
prevent it from falling into the crankcase.
• Remove the bolt
1
while holding the rotor
nut with a wrench.