Crankshaft - BGM Pro Touring (Rotary Valve) 60mm Stroke, 120mm Connecting Rod, Piston Pin Ø16mm

• STROKE: 60mm

• CONNECTING ROD LENGTH: 120mm

• INTAKE TIMING: Rotary Valve (cheek width as PX125/150)

• PISTON PIN: Ø16mm (Ø15mm with conversion piston pin bearing, see accessories)

BEARING
The lubrication of the lower conrod bearing is done via two large lubrication slots and a total of four additional pockets on the side. The SSC racing bearing and the lateral thrust washers ensure solid support. The lubrication of the upper conrod bearing is done via two lubrication holes. The INA piston pin bearing is included in the scope of delivery of the crankshaft.

APPROVAL
The crankshaft design of the PX engines is based on that of the first 125cm³ engines from 1960 with approximately 5 hp output. Unfortunately, Piaggio never really changed this design with the later displacement expansions. Thus, the crankshaft's load capacity is already exhausted with the standard 200ccm models with 12 hp in terms of calculation. The crankshaft cheeks are very narrow and have very little overlap (cheek material that is available above the lower crankpin in terms of diameter). This means that neither a particularly high press fit nor a large crankpin can be used, as would be necessary (for the performance capability of today's engines).
The BGM PRO Touring crankshafts have a very high material quality and bearing. In addition, the crankpins are glued for maximum torsional rigidity. Due to the positive experiences, gathered in many thousands of test kilometers of our own daily used engines, we release the BGM PRO Touring crankshafts for engine outputs up to 25 hp. We recommend the use of a lightweight flywheel with max. 2300g for engines in this performance range.

Conclusion
All in all, the bgm PRO crankshaft offers the highest quality in all respects. Precision in manufacturing, used materials and above all the precise balancing leave nothing to be desired. This guarantees an extremely smooth and vibration-free engine run.

Tip
It is best to order the 24x35x7 oil seal from the Gilera Runner directly with it. The seat of the bgm crankshaft is wider than usual and can therefore be used with a double-lip seal.

About the manufacturer BGM

BGM is a leading brand for high-quality spare parts and accessories for scooters, motorcycles and classic Vespa models, which stands for quality, precision and innovation. With a uncompromising “Made in Germany” philosophy, BGM develops durable products in cooperation with leading engineers and under strict quality control. Whether restoring vintage vehicles or tuning modern scooters – BGM is the first choice for demanding drivers. Thanks to first-class processing and a wide range, BGM offers ideal solutions for performance, everyday use and individuality.