VESPA 633844 IT Service Manual page 149

Vespa GTV 250 i.e.
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 replacement crankcase cannot
be matched with a crankshaft with mixed catego-
ries. The replacement crankshaft has half-shafts
of the same category.
Crankcase Engine half-
halves
Cat. 1
Cat. 2
Cat. 1
Cat. 2
N.B.
TO KEEP THIS POSITION OF THE BUSHINGS
ON THE CRANKCASE, FITTING IS FORCED ON
STEEL RINGS INSERTED IN THE CASTING OF
BOTH CRANKCASE HALVES.
N.B.
DO NOT TAKE THE MEASUREMENT ON THE
TWO HALF-SHELL COUPLING SURFACE
SINCE THE ENDS ARE RELIEVED TO ALLOW
BENDING DURING THE DRIVING OPERATION.
N.B.
CRANKCASES FOR REPLACEMENTS ARE
SELECTED WITH CRANKCASE HALVES OF
THE SAME CATEGORY AND ARE FITTED
WITH CATEGORY B BUSHINGS (BLUE)
Characteristic
Standard driving depth
1.35 ÷ 1.6
Diameter of crankcase without bushing
32.953 ÷ 32.963
29.019 ÷ Original
29.034 and spare
29.028 ÷
29.043
29.022 ÷ Original
29.037
Bushing
shaft
Cat. 1 B
Cat. 2 B
Cat. 2 A
Cat. 1 C
Engine
ENG - 55