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Characteristics
BUSHING CATEGORY
HALVES CATEGORY
B
C
C
E
Combine the crankshaft with two crankwebs category 1 with a crankcase category 1 (or cat. 2 with cat.
2) A spare crankcase cannot be combined with a crankshaft with mixed categories. Spare shafts have
half-shafts of the same category.
CRANKCASE HALVES
Cat. 1
Cat. 2
Cat. 1
Cat. 2
NOTE
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.
NOTE
SPARE CRANKCASES ARE SELECTED WITH CRANK-
CASE HALVES OF THE SAME CATEGORY AND ARE FIT-
TED WITH CATEGORY C (YELLOW) BUSHINGS
Characteristic
Crankshaft-bushing maximum clearance al-
lowed:
0.08 mm
Crankcase diameter without bushing
CAT 1: 32.959 ÷ 32.965 mm
CAT 2: 32.953 ÷ 32.959 mm
Cylinder head
250 cm³ - 300 cm³ Versions
Clean all the coupling surfaces thoroughly before servicing the head. Pay attention to the position of
the springs and valves so as not to change the original position upon refitting them
- Using a trued bar and a thickness gauge, check
that the cylinder head surface is not worn or dis-
torted.
Characteristic
Maximum run-out allowed:
0.1 mm
- In case of irregularities, replace the head.
CHAR - 28
COMBINATIONS
CRANKCASE
2
1
2
1
CATEGORIES
SPORTCITY CUBE 250 - 300
BUSHING INSIDE DIAMETER AFTER FITTING
29.024 ÷ 29.054
29.024 ÷ 29.054
29.018 ÷ 29.048
29.018 ÷ 29.048
ENGINE HALF-SHAFT
Cat. 1
Cat. 2
Cat. 2
Cat. 1
BUSHING
E
B
C
C
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