HRC NSF250R 2012, Owner'S Manual & Parts List

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(1) MAIN JOURNAL BEARING
(2) CRANKCASE I.D. CODE
Main Journal Bearing Inspection
Check the main journal bearing inserts for unusual
wear or peeling.
Bearing Selection
The main journal bearing must be selected, if the
crankshaft and/or crankcase are replaced.
Record the crankcase I.D. code letter (A or B) or
measure the I.D. without bearing inserts.
• Letters (A or B) on the crankcases are the codes
for the crankcase I.D.
4-74
Engine Servicing
Cross-reference the connecting rod and crankpin codes to determine the replacement bearing color.
Crankpin bearing selection table:
Oil Clearance: 0.030 – 0.048 mm (0.0012 – 0.0019 in)
Bearing thickness:
A (Blue): Thickest
B (Black):
C (Brown):
D (Green):
E (Yellow):
Thinnest
(1) COLOR CODE
• After selecting new bearings, recheck the clear-
ance with a plastigauge. Incorrect clearance can
cause severe engine damage.
Connecting Rod I.D. Code
1 2 3
38.000 - 38.006 mm 38.006 - 38.012 mm 38.012 - 38.018 mm
(1.4961 - 1.4963 in) (1.4963 - 1.4965 in) (1.4965 - 1.4968 in)
A
34.997 - 35.003 mm
E D C
Crankpin
(1.3778 - 1.3781 in)
O.D.
B
34.991 - 34.997 mm
D C B
Code
(1.3776 - 1.3778 in)
C
34.985 - 34.991 mm
C B A
(1.3774 - 1.3776 in)
(2)
(1)
(1)