- The bushing housings in the crankcase are avail-
able in two categories, Cat. 1 and Cat. 2, as are
the crankshafts.
- The main bushings are available in three thick-
ness categories, identified by colour markings, as
shown in the table below.
TYPE IDENTIFICATION
A RED
B BLUE
C YELLOW
Type "A" -
RED
Type "B" -
BLUE
Type "C" -
YELLOW
Crankshaft
half-bearing
1.970 ÷
1.973
1.9703 ÷
1.976
1.976 ÷
1.979
Bushing
category
Crankcase
halves cat-
egory
Internal bushing
diameter after fit-
ting
Possible fit-
ting
A 1 29.025 ÷ 29.040 Original
B 1 29.019 ÷ 29.034 Original and
spare
2 29.028 ÷ 29.043
C 2 29.022 ÷ 29.037 Original
Match the shaft with two category 1 crank webs
with the category 1 crankcase (or cat. 2 with cat.
2) Furthermore a spare crankcase cannot be
matched with a crankshaft with mixed categories.
The spare crankshaft has half-shafts of the same
category.
Crankcase halves Engine half-
shaft
Bushing
Cat. 1 Cat. 1 B
Cat. 2 Cat. 2 B
Cat. 1 Cat. 2 A
Cat. 2 Cat. 1 C
N.B.
DO NOT TAKE THE MEASUREMENT ON THE TWO HALF-
SHELL COUPLING SURFACE SINCE THE ENDS ARE RE-
LIEVED TO ALLOW BENDING DURING THE DRIVING
OPERATION.
N.B.
Engine MSS X9 Evolution 250
ENG - 134
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