Yamaha MT-09 2021 - Page 303

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CONNECTING RODS AND PISTONS
2. Tighten:
• Connecting rod bolt
NOTICE
ECA18390
Tighten the connecting rod bolts using the
plastic-region tightening angle method. Al-
ways install new bolts.
TIP
Install by carrying out the following procedures in
order to assemble in the most suitable condition.
a. Replace the connecting rod bolts with new
ones.
b. Clean the connecting rod bolts and lubri-
cate the bolt threads and seats with molyb-
denum disulfide oil.
c. After installing the big end bearing, assem-
ble the connecting rod and connecting rod
cap without installing them onto the crank-
shaft.
d. Tighten the connecting rod bolt while
checking that the sections shown “a” and
“b” are flush with each other by touching the
surface.
TIP
To install the big end bearing, care should be
taken not to install it at an angle and the position
should not be out of alignment.
e. Loosen the connecting rod bolt, remove the
connecting rod and connecting rod cap and
install these parts to the crankshaft with the
big end bearing kept in the current condi-
tion.
3. Install:
• Oil ring expander “1”
• Lower oil ring rail “2”
• Upper oil ring rail “3”
• 2nd ring “4”
• Top ring “5”
(into the piston)
TIP
Be sure to install the piston rings so that the
manufacturer’s marks or numbers “a” face up.
1
a
b
1
2
c
d
New
Connecting rod bolt
30 N·m (3.0 kgf·m, 22 lb·ft)
a. Side machined face
b. Thrusting faces
T
R
.
.
a
b