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)

BEARINGS
The lubrication of the lower connecting rod bearing is done via two large lubrication slots and a total of four additional pockets on the side. The SSC racing bearing and the side thrust washers ensure solid support. The lubrication of the upper connecting rod 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 performance. Unfortunately, Piaggio never really changed this design with the later displacement expansions. Therefore, the crankshaft load capacity is already exhausted with the standard 200ccm models with 12hp in terms of calculation. The crankshaft cheeks are very narrow and have very little overlap (cheek material that is available above the lower crankshaft journal in terms of diameter). This means that neither a particularly high interference fit nor a large crankshaft journal can be used, as would be necessary (for the performance capacity of today's engines).
The BGM PRO Touring crankshafts have very high material quality and bearings. In addition, the crankshaft journals are glued for maximum torsional rigidity. Based on the positive experiences, gathered in many thousands of test kilometers of our own daily used engines, we approve the BGM PRO Touring crankshafts for engine performance up to 25hp. We recommend the use of a lightweight flywheel with max. 2300gr in engines in this performance range.

Conclusion
All in all, the bgm PRO crankshaft offers the highest quality in all aspects. 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 running.

Tip
It is best to order the crankshaft seal 24x35x7 from Gilera Runner directly. The sealing 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 controls. Whether restoring vintage vehicles or tuning modern scooters – BGM is the first choice for demanding drivers. Thanks to first-class workmanship and a wide range of products, BGM offers ideal solutions for performance, everyday use and individuality.