the bushings for connecting the connecting rods to the crankshaft can be defined according to the
following table:
CONNECTING RODS - CRANKSHAFT COUPLING
Crank pin
dimensional class
Connecting rod class
1
Clearance Connecting rod class
2
Clearance
X BLUE + YELLOW 0.053 - 0.026 mm YELLOW + YELLOW
(alternatively BLUE +
GREEN)
0.053 - 0.027 mm
Y YELLOW + YELLOW
(alternatively BLUE +
GREEN)
0.054 - 0.026 mm YELLOW + GREEN 0.054 - 0.027 mm
Z YELLOW + GREEN 0.054 - 0.026 mm GREEN + GREEN 0.054 - 0.028 mm
N.B.
The thicker bushing must be mounted on the side of the connecting rod (upper area).
Construction features
CRANK PINS
Class X Class Y Class Z
Min: 35.885 mm Min: 35.880 mm Min: 35.874 mm
Max: 35.880 mm Max: 35.874 mm Max: 35.869 mm
CONNECTING ROD CLASSES
Class 1 Class 2
Min: 39.010 mm Min: 39.017 mm
Max: 39.016 mm Max: 39.022 mm
CONNECTING ROD BUSHINGS
BLUE YELLOW GREEN
1.547 mm 1.552 mm 1.557 mm
1.552 mm 1.557 mm 1.562 mm
Bushing selection
CRANKSHAFT BUSHINGS
Crankcase category
Crankcase selectable in two classes (A - B) for the
diameter of the hole on the three main supports of
the crankshaft.
The category is marked on the lower crankcase,
on the right side, at the crankshaft.
The thee main supports may be of different
classes (e.g: A - B - B or B - B - B or A - B - A, etc.).
RS 660 - Tuono 660 Engine
ENG - 189
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