Crankshaft -BGM ORIGINAL Standard (rotary slider)- Vespa PV125, ET3 125, PK80 S, PK125 S (Ø 19mm cone)

BGM ORIGINAL standard crankshaft Ø19 mm for Vespa PV, ET3, PK S

Material:
The BGM crankshafts are forged like in the good old Piaggio days. During forging, the material is pressed together under high temperature and pressure. This results in a higher density of the material. Heat is dissipated much better. The material is more resistant to warping. This is a huge advantage over other manufacturers' reworked crankshafts, whose materials often do not even reach the level of a standard shaft.


Tuning:
The high quality of the material used also allows the use of very light pole wheels without the risk of crankshaft damage. This allows better acceleration behavior to be combined with significantly increased engine durability. This is particularly important on high-displacement and high-speed engines.


Timing angle:
The timing angles of this crankshaft correspond to those of a standard 125cc shaft. This makes it equally suitable for the construction of a standard 125cc engine as well as a solid 133cc street tuning. The precise manufacturing, the material used and the good bearings enable many tens of thousands of kilometers of trouble-free mileage. For higher performance requirements, we also offer the same shaft as a racing version with an extended intake control angle.

Design:

Crankshaft

with a so-called small 19 mm cone. Such shafts can be recognized by the diameter of the shaft sealing ring surface on the alternator side. This is the surface that is located after the cone but before the bearing seat of the bearing on the crankshaft stub.

• Cone: 19 mm
• Control angle: Standard
• Stroke: 51 mm
• Connecting rod length: 97 mm
• Connecting rod bearing top: 15 mm

TIP: The 19 mm diameter shafts have a narrow pointed cone, which can break off in powerful engines with high engine speeds. In this case, we recommend converting to a crankshaft with a 20 mm taper. However, this requires the ignition to be converted.