VESPA GTV 250 i.e. 2008 Service Station Manual page 142

Engine
- The oil feeding channel section is also affected
by the bushings driving depth compared with the
crankshaft axial clearance of the limiting surface.
- Check the inside diameter of the main bushings
in the three directions indicated in the diagram.
- Repeat the measurements for the other bushing
half. see diagram.
- There are three crankcase versions: with RED
main bushings, with BLUE main bushings and with
YELLOW main bushings.
- 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 subdivided into 3 cate-
gories according to thickness; see table below:
TYPE
A
B
C
Type "A" -
RED
Crankshaft 1.970 -
half-bearing 1.973
Bushing Crankcase Internal bushing
category halves cat- diameter after fit-
egory
A 1
B 1
2
C 2
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
ENG - 142
IDENTIFICATION
RED
BLUE
YELLOW
Type "B" - Type "C" -
BLUE YELLOW
1.9703 - 1.976 - 1.979
1.976
Possible fit-
ting
ting
29.025 - 29.040 Original
29.019 - 29.034 Original and
29.028 - 29.043 spare
29.022 - 29.037 Original
Vespa GTV 250 i.e.