BGM PRO crankshaft for Vespa Wideframe models made from high-alloy forging blanks. Ideally suited in combination with the BGM PRO 150cc Wideframe tuning cylinder.

The crankshaft is designed as a heavy-duty tuning crankshaft, but is of course also a clear recommendation as a virtually indestructible shaft for original engines.

  • stroke: 57mm

  • connecting rod length: 110mm

  • piston pin: Ø15mm

  • connecting rod bearing: Needle bearing (top and bottom)

A big advantage of the BGM PRO crankshaft compared to an original one is the use of a high quality connecting rod with needle bearing (instead of a plain bearing bush) as well as a slotted lower connecting rod eye. The oil consumption is reduced so that the engines with today's high-quality oils can be run with 1:50 mixture without problems.

The balancing factor was improved by a hollow drilled pin.

The crankshaft is suitable for all 125ccm and 150ccm engines. The 125cc engines have a stroke of 54mm ex works, therefore a cylinder with a 57mm stroke is required (BGM1550, Pinasco Nordkap).

The BGM PRO Wideframe crankshaft fits the following vehicles:

  • Vespa: VM, VN

  • ACMA: 125 (70191 - 295883), GL150

  • Motovespa 125N, 125S, V56, V58, V72

  • Douglas GL2, 42L2, 92L2


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Egon A. from Adneter Riedl 09/15/2025
Ball bearing
Dimensions
15x19x20mm
 
Piston pin
Diameter
15 mm
 
Crankshafts
Stroke
57 mm
Crankcase must be spindled
nein
Motor housing must be modified
nein
Rotary vane crankshaft
nein
Full cheek crankshaft
nein
Bearing seat diameter on alternator side
25 mm
Bearing seat diameter on drive side
25 mm
Diameter of sealing ring seat on alternator side
20 mm
Diameter of sealing ring seat on drive side
20 mm
 
Connecting rod
Connecting rod length
110 mm
Connecting rod eye top diameter
19 mm
 
OEM numbers (for comparison purposes only)
Piaggio:
018600, 18600
Scooter Center:
BGM057110
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