BGM Pro Touring (Rotary Valve) 57mm Crankshaft Vespa P125-150, Cosa125, PX125-150, LML Star 125 2T
The BGM crankshafts are made from quality forged materials! The crank webs are also forged, but are then CNC machined. The conrod have two large slots, this is for lubrication of the piston pin and bearing. The BGM Crank can be used for any scooter up to 20HP, due to the high quality material used.
BGM COMMENTS: Compared too many other racing crankshafts, the bgm PRO Touring crankshaft has a much better layout of the intake time. For tuning cylinders the standard shaft with its very short intake time cannot keep up. The bgm PRO shaft, on the other hand, closes on a PX motor housing approx. 58° after top dead center (depending on the motor housing, this varies ex works). The motor can be well tuned with these control angles. TIP: If the intake is machined in a way that the crankshaft opens the intake slot earlier, additional power can be gained. A good value is about 120° TDC.
- disc (ROTARY) valve
- stroke 57.0mm
- conrod 105.0mm
- pin 15mm
Comparison No. BGM031120G (BGM)