Yamaha 2004 YXR660 Service Manual page 149

CAMSHAFT AND CYLINDER HEAD
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c. Temporarily install the camshaft sprocket on
the camshaft. (Do not install the bolts.)
Then, install the timing chain on the cam-
shaft sprocket.
NOTE:
Make sure the small holes 3 on the camshaft
face upward.
d. 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
e. Install the decompressor cam guide plates
9 and camshaft sprocket bolts 0.
Camshaft sprocket bolt
20 Nm (2.0 m · kg, 14 ft · lb)
NOTE:
Insert a screwdriver into the timing chain ten-
sioner hole and push the timing chain guide
(intake side) inward.
f. Remove the retaining wire.
L LLL L LLL L L LLL L L LLL L
3. Install:
• timing chain guide (exhaust side)
4. Install:
• timing chain tensioner
M MMM M MMM M M MMM M M MMM M
a. Lightly press the timing chain tensioner rod
into the timing chain tensioner housing by
hand.
b. While pressing the timing chain tensioner
rod, wind it clockwise with a thin screwdriver
1 until it stops.
ENG
L LLL L L LLL L LLL
M MMM M M MMM M MMM