Yamaha YFM70RY Service Manual page 205

ECA1S3L016
NOTICE
Do not turn the crankshaft when installing
the camshaft to avoid damage or improper
valve timing.
e. While holding the camshaft, temporarily tight-
en the camshaft sprocket bolts.
f. Remove the wire from the timing chain.
L LLL L LLL L L LLL L
4. Install:
• Timing chain tensioner
M MMM M MMM M M MMM M
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.
TIP
Install the gasket with its beaded side facing the
timing chain tensioner end.
Timing chain tensioner bolt
10 Nm (1.0 m·kg, 7.2 ft·lb)
d. Install the spring and timing chain tensioner
cap bolt.
Timing chain tensioner cap bolt
20 Nm (2.0 m·kg, 14 ft·lb)
6 New
L LLL L L LLL L L LLL L
M MMM M M MMM M M MMM M
3
2 New
1
LLL
L LLL L LLL L
MMM
5. Turn:
• Crankshaft
(several turns counterclockwise)
6. Check:
• "I" mark "a"
Align the "I" mark on the AC magneto rotor
with the stationary pointer "b" on the AC mag-
neto cover.
• "I" mark "c"
Align the "I" mark on the camshaft sprocket
with the stationary pointer "d" on the cylinder
head.
Out of alignment → Correct.
Refer to the installation steps above.
d
c
7. Tighten:
• Camshaft sprocket bolts
5-12
CYLINDER HEAD
4
5
L LLL L L LLL L L LLL L
Camshaft sprocket bolt
20 Nm (2.0 m·kg, 14 ft·lb)
L LLL L LLL
a
b