Yamaha YBR250 2007 Service Manual page 203

b
a
d
1
CYLINDER HEAD
4. Install:
• camshaft sprocket
a. Turn the crankshaft counterclockwise.
b. Align the "I" mark a on the AC magneto with the
stationary pointer b on the AC magneto cover.
c. Remove the wire which blocks the cam chain
downfall.
d. Install the drive chain 1 onto the camshaft
sprocket, install the camshaft sprocket onto the
camshaft, and finally tighten the bolt handly.
e. Make sure that the "I" mark c of the timing
sprocket is aligned with the stationary pointer d
c
in the cylinder head.
NOTE:
1
• When installing the camshaft sprocket, be sure
to keep the chain tensioned on the exhaust side.
• Align the camshaft pin with the sprocket rip.
CAUTION:
Do not turn the crankshaft when installing the
camshaft to prevent damages or incorrect
valve timing.
5. Install:
• timing chain tensioner
a. While gently finger tightening the timing chain
tensioner rod, use a screwdriver 1 to fully
spin the shaft clockwise.
b. With the rod totally removed, install the gasket
and the timing chain tensioner and tighten the
mounting bolts to the specified torque.
c. Release the system, turning the screwdriver
counter clockwise. Make sure that the gasket
1 is properly set and tighten the bolts 2 to the
specified torque.
5-13
ENG