Yamaha 2007 XP500 Service Manual page 278

Bearing color code
1.Blue 2.Black 3.Brown 4.Green
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5. Measure:
Crankshaft-journal-to-crankshaft-journal
G
bearing clearance.
Out of specification → Replace the crank-
shaft journal bearings.
Crankshaft-journal-to-crank-
shaft-journal bearing clearance
0.04–0.082 mm (0.0016–0.0032
in)
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The following procedure applies to all of the
journal bearing.
ECA15B1027
CAUTION:
On the journal, the larger value is used as a
basis for calculation of the oil clearance, and
on the journal bearing, the smaller value is
used.
j. Clean the surface of main journal and journal
bearings.
k. Check the bearing surface. If the bearing sur-
face is worn or scratched, the bearings
should be replace.
NOTE:
If either of the right or left journal bearing is worn
or scratched, both bearings should be replaced
as a set.
l. Measure the outside diameter "a" of each
main journal at two places. If it is out of spec-
ification, replace the crankshaft.
CRANKCASE AND CRANKSHAFT
m. Measure the inside diameter "b" of each jour-
nal bearing at two places.
n. If journal bearing inside diameter is "45.03"
and crankshaft journal outside diameter is
"44.98", then the main journal oil clearance is:
Main journal oil clearance: Journal bearing
inside diameter–
Main journal outside diameter
=
45.03–44.98 = 0.05 mm
If the oil clearance is out of specification, se-
lect a replacement bearings.
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6. Select:
Crankshaft journal bearings (J1, J2)
G
NOTE:
The numbers "a" stamped into the crankshaft
G
web and the numbers "1" on the crankcase are
used to determine the replacement crankshaft
journal bearing size.
"J1, J2" refer to the bearings shown in the
G
crankshaft illustration.
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