Yamaha YP250 Mobility Scooter User Manual


 
4-9
CYLINDER HEAD
ENG
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NOTE:
CAUTION:
3. Install:
SCam sprocket
1
STiming chain
2
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.
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.
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.
4. Install:
SBreather plate
1
SPlane washer
2