Checking The Connecting Rods - Yamaha YZF-R25 Service Manual

TIP
• Align the projections "c" of the crankshaft jour-
nal upper bearings with the notches "d" in the
upper crankcase.
• Do not move the crankshaft until the clearance
measurement has been completed.
3
e. Tighten the bolts to specification in the proper
tightening sequence.
Refer to "ASSEMBLING THE CRANKCASE"
on page 5-72.
f. Remove the upper crankcase and the crank-
shaft journal upper bearings.
g. Measure the compressed Plastigauge®
width "e" on each crankshaft journal.
If the crankshaft-journal-to-crankshaft-jour-
nal-bearing clearance is out of specification,
select replacement crankshaft journal bear-
ings.
▲ ▲▲▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲
4. Select:
• Crankshaft journal bearings (J
TIP
• The numbers "A" stamped into the crankcase
and the numbers "B" stamped into the crank-
shaft web are used to determine the replace-
ment crankshaft journal bearing sizes.
• J –J refer to the bearings shown in the crank-
1 3
case and crankshaft web illustration.
• If J –J are the same, use the same size for all
1 3
of the bearings.
CRANKSHAFT AND BALANCER SHAFT
c
d
e
e
▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲
–J )
1 3
J1
A
B
For example, if the crankcase J
shaft web J
ly, then the bearing size for J
J (crankcase) – J
1
= 5 – 3
= 2 (Black)
▲▲▲
EAS31315

CHECKING THE CONNECTING RODS

1. Measure:
• Crankshaft-pin-to-big-end-bearing clearance
Out of specification → Replace the big end
bearings.
5-81
J2
J1
J2
J3
J1 J2 J3
2 2 3 3 3
numbers are 5 and 3 respective-
1
(crankshaft web)
1
Bearing color code
1.Blue 2.Black 3.Brown 4.Green
5.Yellow
Oil clearance
0.036–0.060 mm (0.0014–0.0024
in)
J3
and crank-
1
is:
1