Yamaha YFM660FS, Supplementary Service Manual

Page: 235 / 478

4 - 22
ENG
CAMSHAFT AND CYLINDER HEAD
2.Install:
●
Camshaft
●
Camshaft sprocket
*****************************************************
Installation steps:
●
Turn the crankshaft counterclockwise with a
wrench.
●
Align the “I” mark
1
on the rotor with the sta-
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.
●
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
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