Yamaha 2004 YP400 Service Manual page 277

a
È
É
1
b
1
5 - 64
CRANKSHAFT
NOTE:
If either the left or right journal bearing is worn
or scratched, replace both bearings as a set.
c. Measure the crankshaft journal outside
diameter a in two places. If it is out of spec-
ification, replace the crankshaft.
d. Measure the journal bearing inside diame-
ter b in two places.
CAUTION:
When calculating the journal oil clearance,
use the larger of the two values from the
crankshaft journal and use the smaller of
the two values from the journal bearing.
e. If the journal bearing inside diameter is
"35.064" and the crankshaft journal outside
diameter is "35.014", then the journal oil
clearance is:
Journal oil clearance:
Journal bearing inside diameter –
Crankshaft journal outside diameter =
35.064 – 35.014 = 0.050 mm
If the oil clearance is out of specification,
select replacement bearings.
L LLL L LLL L L LLL L
5. Select:
• crankshaft journal bearings
NOTE:
The numbers 1 on the crankcase are used to
determine the replacement crankshaft journal
bearing size.
È Left crankcase
É Right crankcase
ENG
L LLL L L LLL L L LLL L LLL