Yamaha 2005 MT-01, Service Manual

Page: 288 / 435

CRANKSHAFT
5-89
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4. Select:
• Big end bearings (“P
1
”–“P
2
”)
NOTE:
• The numbers “a” stamped into the crankshaft
web and the numbers “b” on the connecting
rods are used to determine the replacement
big end bearing sizes.
• “P
1
”–“P
2
” refer to the bearings shown in the
crankshaft illustration.
For example, if the connecting rod “P
1
” and
the crankshaft web “P” numbers are “5” and
“2” respectively, then the bearing size for “P
1
”
is:
5. Measure:
• Crankshaft journal diameter “a”
Out of specification
→
Replace the crank-
shaft.
NOTE:
Measure the diameter of each crankshaft journal
at two places.
6. Measure:
• Crankshaft journal bearing inside diameter
“a”
Out of specification
→
Replace the crank-
case assembly.
NOTE:
Measure the inside diameter of each crankshaft
journal bearing at two places.
P
1
P
2
a
“P
1
” (connecting rod) - “P” (crankshaft)
=
5 - 2 = 3 (brown)
Bearing color code
1.Blue 2.Black 3.Brown 4.Green
5.Yellow
Crankshaft journal diameter
49.968–49.980 mm (1.9672–
1.9677 in)
Crankshaft journal bearing inside
diameter
50.010–50.030 mm (1.9689–
1.9697 in)