Vespa GS 150 crankshaft with brass bush.
The lower bearing has two slots for lubricating the bearing. The brass bushing is also lubricated through a generously dimensioned slot.

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Ball bearing
Dimensions
15mm
 
Piston pin
Diameter
15 mm
 
Crankshafts
Stroke
57 mm
Thread on alternator side
M11x1,5 Rechtsgewinde
Thread on drive side
M10x1,5 Rechtsgewinde
Crank web diameter
93 mm
Crankcase must be spindled
nein
Motor housing must be modified
nein
Rotary vane crankshaft
nein
Full cheek crankshaft
nein
Wide crank webs
34 mm
Bearing seat diameter on alternator side
25 mm
Bearing seat width on alternator side
12 mm
Bearing seat diameter on drive side
25 mm
Bearing seat width on drive side
12 mm
Diameter of sealing ring seat on alternator side
20 mm
Wide sealing ring seat on alternator side
8 mm
Diameter of sealing ring seat on drive side
20 mm
Wide sealing ring seat on drive side
6 mm
Length of crankshaft stub on alternator side
34 mm
Length of crankshaft stub on drive side
22 mm
Width over all
163 mm
 
Connecting rod
Connecting rod length
105 mm
Connecting rod eye top diameter
15 mm
Lifting pin diameter
18 mm
 
OEM numbers (for comparison purposes only)
Piaggio:
026780, 26780
Scooter Center:
A182