- There is only one type of main bushing housing
hole in the crankcase
The standard bushing diameter after driving is var-
iable on the basis of a coupling selection.
- 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"
- YEL-
LOW
Crankshaft
half-bearing
1.970 ÷
1.973
1.9703 ÷
1.976
1.976 ÷
1.979
Bush-
ing cat-
egory
Crank-
case
halves
category
Internal bush-
ing diameter
after fitting
Possible
fitting
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.
MP3 125 Engine
ENG - 55
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