Yamaha YZF-R1 Series Service Manual page 370

2. Tighten:
• Connecting rod bolts
ECA18390
NOTICE
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 con-
dition.
• Install the new connecting rod bolt without
cleaning and without any oil.
a. Replace the connecting rod bolts with new
ones.
b. After installing the big end bearing, as-
semble the connecting rod and connecting
rod cap without installing them onto the
crankshaft.
c. Tighten the connecting rod bolt while
checking that the sections shown "a" and
"b" are flush with each other by touching
the surface.
Connecting rod bolt
30 N·m (3.0 kgf·m, 22 lb·ft)
TIP
To install the connecting rod cap, care should be
taken not to install it at an angle and the position
should not be out of alignment.
b
a. Side machined face
b. Thrusting faces
d. Loosen the connecting rod bolt, remove
the connecting rod and connecting rod
cap and install these parts to the crank-
shaft with the big end bearing kept in the
current condition.
CONNECTING RODS AND PISTONS
New
a
5-87
3. Install:
• Top ring "1"
(into the piston)
• 2nd ring "2"
• Upper oil ring rail "3"
• Oil ring expander "4"
• Lower oil ring rail "5"
TIP
Be sure to install the piston rings so that the
manufacturer's marks or numbers "a" face up.
G089011
4. Install:
• Piston "1"
(onto the respective connecting rod "2")
• Piston pin "3"
TIP
• Apply engine oil onto the piston pin.
• Make sure that the " " mark "a" on the connect-
ing rod faces left when the punch mark "b" on
the piston is pointing up as shown.
• Reinstall each piston into its original cylinder.
2
3
5. Install:
• Piston pin clip "1"
New
a. Install the piston pin clip "1" in the piston as
shown in the illustration.
TIP
When installing the first piston pin clip, place oth-
er piston pin "2" under the piston pin as shown in
the illustration.
a b
1