Yamaha R15 2022 Service Manual page 250

Cylinder head bolt (1st)
12 N·m (1.2 kgf·m, 8.9 lb·ft)
Cylinder head bolt (final)
24 N·m (2.4 kgf·m, 18 lb·ft)
• Cylinder head bolt (Chain side) "b"
Cylinder head bolt (Chain side)
10 N·m (1.0 kgf·m, 7.4 lb·ft)
TIP
• Lubricate the cylinder head bolts and washers
with engine oil.
• Tighten the cylinder head bolts in the proper
tightening sequence as shown and torque
them in two stages.
a
3. Install:
• Camshaft sprocket
a. Turn the crankshaft counterclockwise.
b. Align the "I" mark "a" on the magneto rotor
with the stationary pointer "b" on the mag-
neto cover.
c. When the piston is at TDC on the com-
pression stroke, align the "I" mark "c" on
the camshaft sprocket with the mark "d" on
the camshaft stopper plate.
d. Install the timing chain onto the camshaft
sprocket, and then install the camshaft
sprocket onto the camshaft.
CYLINDER HEAD
TIP
When installing the camshaft sprocket, be sure
to keep the timing chain as tight as possible on
the exhaust side.
ECA13740
Do not turn the crankshaft when installing
the camshaft(s) to avoid damage or improper
valve timing.
e. While holding the camshaft, temporarily
b
tighten the camshaft sprocket bolt.
f. Remove the wire from the timing chain.
4. Install:
• Timing chain tensioner gasket
• Timing chain tensioner
a. Apply sealant to the timing chain tensioner
bolt threads.
b. While lightly pressing the timing chain ten-
sioner rod by hand, turn the tensioner rod
fully clockwise with a small screwdriver "1".
c. With the timing chain tensioner rod turned
all the way into the timing chain tensioner
housing (with the small screwdriver still in-
stalled), install the gasket and the timing
chain tensioner "2" onto the cylinder block.
d. Tighten the timing chain tensioner bolts "3"
to the specified torque.
5-13
ENG
Yamaha bond No. 1215
90890-85505
(Three bond No.1215-B)
Timing chain tensioner bolt
10 N·m (1.0 kgf·m, 7.4 lb·ft)
Small screw driver
YSST-609
New