The BGM crankshafts are forged as in the good old Piaggio times. When forging, the material is pressed together under temperature and high pressure. This results in a higher density of the material. Heat is dissipated much better. The material is more resistant to distortion. This is a huge advantage over the after manufactured crankshafts of other manufacturers whose used materials often do not even reach the level of a series wave.
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 performance to be combined with a significantly increased durability of the engine. This is especially on displacement and high-speed engines of utmost importance.
Control angle:
The control angles of this crankshaft correspond to those of a standard shaft. Thus, it is equally suitable for the construction of a standard 50cc engine as well as a solid road tuning with more displacement. The precise manufacturing, the material used and the good bearing allow many trouble-free tens of thousands of kilometers mileage.
For higher performance requirements, we lead the same wave also as a racing version with extended intake control angle.
Type:
Crankshaft with the so-called small cone with 19mm. Such shafts are recognizable by the diameter of the alternator-side oil seal area. This is the surface that is located after the cone but before the bearing seat of the Limalager on the crankshaft stub. This shaft is ideal for converting engines that still have a gunmetal bushing as the upper connecting rod bearing to a conventional bearing. Often the bushings are already knocked out and can no longer cope with a displacement expansion.
- Cone: 19mm
- Control angle: Standard
- Stroke: 43mm
- Plain bearing at the top: 12mm
Who wants to expand the displacement strongly on the basis of the small stroke of the 50cc models (up to 110cc are possible!) Should think about using the PK 50 XL shaft type with 20mm cone diameter. In contrast to the narrow pointed 19mm cone, which can tear off under heavy load of an engine converted to over 100cc, the much stronger dimensioned Lima stub of the 20mm cone shafts is immune to any load. However, a conversion of the ignition is then inevitable since it is not possible or reasonable to equip a pole wheel for the old ignition technology with a large cone.
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