Yamaha YFM90RA Model Vehicle User Manual


 
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ENG
CYLINDER HEAD
EBS00233
INSTALLING THE CYLINDER HEAD
1. Install:
cyl. head assy. 1
cam shaft comp.
cap, camshaft
TIP
Tighten the nuts in two stages and a crisscross
pattern.
2. Install:
cam shaft comp.
a. Rotate the camshaft to align the round h-
ole in camshaft sprocket away from t-
he cylinder head.
b.Turn the crankshaft clockwise with a wrench.
c. Align the “T” mark on the rotor with the
stationary pointer on the crankcase.
When the “T” mark is aligned with the sta-
tionary pointer, the piston is at the Top Dead
Center (TDC).
NOTICE
Do not turn the crankshaft during the cam-
shaft
comp. installation.
d. Place the timing chain onto the camshaft
sprocket.
e. Install the camshaft cap onto the camshaft
comp. and
finger tighten the nut with wa-
TIP
When the camshaft sprocket alignment ma-
rk is aligned with the cylinder head alig-
nd hole in camshaft sprocket away f-
f. Force the camshaft clockwise and counter-
clockwise to remove timing chain slack.
g. Insert a screwdriver into the timing chain
tensioner hole and push the timing chain
guide inward.
h. While pushing the timing chain guide and
the camshaft sprocket alignment mark
is aligned with the cylinder head alignme-
nt mark ,be sure to align the round hol-
sher.
washer
nut
nment mark , be sure to align the rou-
rom the cylinder head.
cylinder head.
e in camshsft sprocket away from the