Yamaha RAPTOR YFM50S, Service Manual

Page: 96 / 236

4 - 7
ENG
CYLINDER HEAD
EBS00220
REMOVING THE CYLINDER HEAD
1. Align:
• “T” mark on the rotor
(with the stationary pointer on the crank-
case)
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a. Turn the crankshaft counterclockwise with a
wrench.
b. Align the “T” mark
1
on the rotor with the
stationary pointer
2
on the crankcase.
When the “T” mark is aligned with the sta-
tionary pointer, the piston is at Top Dead
Center (TDC).
NOTE:
_
TDC on compression stroke check:
• Both rocker arms must have a valve clear-
ance when the camshaft sprocket alignment
mark
3
is aligned with the cylinder head
alignment mark
4
.
• If not, give the crankshaft one counterclock-
wise turn to meet the above condition.
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2. Loosen:
• camshaft sprocket bolt
1
Use the sheave holder
2
to hold the rotor.
NOTE:
Do not allow the sheave holder to touch the
projection on the rotor.
3. Remove:
• timing chain tension adjuster
• timing chain tensioner assembly
• camshaft sprocket
NOTE:
_
• Fasten a safety wire to the timing chain to
prevent it from falling into the crankcase.
• When removing the camshaft sprocket, it is
not necessary to separate the timing chain.
Sheave holder
P/N. YS-01880-A, 90890-01701
4
3
1
2