Yamaha XT660R S Service Manual page 254

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CYLINDER HEAD
c. Install the timing chain 1 onto the camshaft
sprocket 2, then the camshaft sprocket
onto the camshaft, and then finger tighten
the camshaft sprocket bolts.
NOTE:
To install the camshaft sprocket sprocket,
install the projection 3 on the camshaft
sprocket into the slot a in the decompression
lever.
d. Make sure the "I" mark d on the camshaft
sprocket with the stationary pointer e on
the cylinder head.
NOTE:
_
• When installing the camshaft sprocket, be
sure to keep the timing chain as tight as pos-
sible at the exhaust end of the chain.
• Align the projection on the camshaft with the
slot in the camshaft sprocket.
CAUTION:
_
Do not turn the crankshaft when installing
the camshaft to avoid damage or improper
valve timing.
e. Remove the wire from the timing chain.
L LLL L LLL L L LLL
5. Install:
• timing chain tensioner
M MMM M MMM M M MMM
a. Remove the timing chain tensioner cap bolt
1, copper washer 2 and spring 3.
b. Release the timing chain tensioner one-way
cam 4 and push the timing chain tensioner
rod 5 all the way into the timing chain ten-
sioner housing.
c. Install the timing chain tensioner and gasket
6 onto the cylinder.
Timing chain tensioner bolt
10 Nm (1.0 m · kg, 7.2 ft · lb)
NOTE:
Install the gasket with its beaded side facing
the timing chain tensioner end.
5 - 14
ENG
L L LLL L L LLL L
M M MMM M M MMM M
L LLL L LLL
M MMM M MMM