Yamaha YFM660FS Grizzly 4x4 Supplementary Service Manual page 235

CAMSHAFT AND CYLINDER HEAD
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2.Install:
Camshaft
G
Camshaft sprocket
G
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Installation steps:
G
Turn the crankshaft counterclockwise with a
wrench.
Align the "I" mark 1 on the rotor with the sta-
G
tionary pointer 2 on the crankcase cover.
When the "I" mark is aligned with the station-
ary pointer, the piston is at the Top Dead
Center (T.D.C.).
CAUTION:
Do not turn the crankshaft during the cam-
shaft installation.
G
Temporarily install the camshaft sprocket on
the camshaft. (Do not install the bolts.) Then,
install the timing chain on the camshaft
sprocket.
NOTE:
Make sure the small holes 3 on the camshaft
face upward.
Align the notches 4 on the decompressor
G
cams with the projections 5 on the decom-
pressor spring lever, then install the cam-
shaft sprocket on the camshaft.
NOTE:
Check that each part is positioned as shown in
the illustration.
6 Small holes on camshaft sprocket
7 Punch mark on decompressor spring lever
8 Top front of cylinder head
ENG