Yamaha YP250 Service Manual page 105

CYLINDER HEAD
3. Install:
S Cam sprocket 1
S Timing chain 2
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Installing steps:
D Turn the primary sheave counterclockwise
until the TDC mark a matches the stationary
pointer b .
D Align the "I" mark c on the cam sprocket with
the stationary pointer d on the cylinder
head.
D Fit the timing chain onto cam sprocket and
install the cam sprocket on the camshaft.
NOTE:
D When installing the cam sprocket, keep the
timing chain as tense as possible on the ex-
haust side.
D Align the match mark c on the cam sprocket
with the stationary pointer d on the cylinder
head.
D Align the pin on the camshaft with the slot in
the cam sprocket.
CAUTION:
Do not turn the crankshaft during installa-
tion of the camshaft. Damage or improper
valve timing will result.
D While holding the camshaft, temporarily
tighten the bolts.
D Remove the safety wire from the timing
chain.
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4. Install:
S Breather plate 1
S Plane washer 2
4-9
ENG