Yamaha TT-R90(R), Instruction Manual, Page: 74 / 132

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.