VESPA GTS 250 I.E., Workshop Manual

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- There are three crankcase versions: with RED
main bushings, with BLUE main bushings and with
YELLOW main bushings.
- There just one type of main bushing housing hole
in the crankcase
The standard diameter of the main bushings after
fitting is variable depending on a coupling selec-
tion.
- 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
Main 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 replacement crankcase cannot
be matched with a crankshaft with mixed catego-
ries. The replacement crankshaft has half shafts
of the same category.
Engine
Vespa GTS 250 I.E.
ENG - 54