Crankshaft -BGM Pro Touring (rotary valve) 60mm stroke, 105mm conrod- Vespa PX125, PX150
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Description
stroke: | 60 mm |
thread rotor side: | M12x1,25 right-hand thread |
thread drive side: | M12x1,5 right-hand thread |
diameter crankwebs: | 98 mm |
diameter bearing seat rotor side: | 25 mm |
diameter bearing seat drive side: | 25 mm |
diameter oil seal seat rotor side: | 24 mm |
diameter oil seal seat drive side: | 31 mm |
The bgm PRO Touring crankshafts are forged. The material is denser and therefore conducts heat better and is more resistant to distortion. In addition to the crank webs, the connecting rod is also forged.BEARINGThe lower connecting rod bearing is lubricated via two large lubrication slots and a total of four additional pockets on the side. The SSC race bearing and side thrust washers provide a solid bearing. The upper connecting rod bearing is lubricated via two lubrication holes. The INA piston pin bearing is included with the crankshaft.HUB
The shaft is available with 60mm (long stroke) and with 57mm (standard) stroke. With the long-stroke version, more displacement is achieved, and at the same time the cylinder’s timing angles (overflow and exhaust ports) can be changed to increase performance.INLET ANGLECompared to many other racing shafts, the bgm PRO Touring shaft has a much better inlet layout. With tuning cylinders, the standard shaft with its very short intake time can’t keep up. The bgm PRO shaft on the other hand closes on a PX engine case about 58° after top dead center (depending on the engine case this varies from factory). The engine can be tuned well with these timing angles. TIP: If the intake is machined so that the crankshaft clears the intake slot earlier, additional power can be gained. A good value has been found to be approx. 120° from TDC.RELEASE
The crankshaft design of the PX engines is based on that of the first 125 cc engines of 1960 with approx. 5 HP performance. Unfortunately Piaggio never really changed this design in the later displacements. So the load capacity of the crankshaft is already exhausted with the standard 200cc models with 12HP. The crank cheeks are very narrow and have very little overlap (cheek material which, seen in the diameter, is available over the lower stroke pin). This means that neither a particularly high interference fit nor a large crankpin can be used, as would be necessary (for the performance of today’s engines).
The BGM crankshafts are approved for a performance up to approx. 20HP due to their high material quality and bearing. For engines in this power range we recommend the use of a lightened pole wheel with a maximum weight of 2300gr.
CONCLUSION
The bottom line is that the bgm PRO crankshaft offers the highest quality in every component. Precision manufacturing, the materials used and above all the precise balancing leave nothing to be desired. This guarantees extremely smooth and vibration-free engine running.TIP
It is best to order the 24x35x7 oil seal from the Gilera Runner directly. The wedi seat of the bgm shaft is wider than usual and can therefore be used with a double lipped Viton wedi.
- Vespa (Piaggio) P 80 X (V8X1T, -1983)
- Vespa (Piaggio) PX 80 E FL (V8X1T, 1983-)
- Vespa (Piaggio) PX 80 E FL Elestart (V8X1T, 1984-1990)
- Vespa (Piaggio) Cosa 150 CL (VLR1T)
- Vespa (Piaggio) Cosa 150 CLX (VLR1T300)
- Vespa (Piaggio) Cosa 150 FL (VLR2T)
- Vespa (Piaggio) P 150 X (VLX1T, -1980)
- Vespa (Piaggio) PX 150 E FL (VLX1T, 1984-1997)
- Vespa (Piaggio) PX 150 E (VLX1T, 1981-1983)
- Vespa (Piaggio) Cosa 125 CL (VNR1T)
- Vespa (Piaggio) Cosa 125 CLX (VNR1T300)
- Vespa (Piaggio) Cosa 125 CLX (VNR1T301)
- Vespa (Piaggio) P 125 X (VNX1T, -1983)
- Vespa (Piaggio) PX 125 E FL (VNX2T, 1984-1997)
- Vespa (Piaggio) PX 125 E FL (ZAPM09300, 1998-2000)
- Vespa (Piaggio) PX 125 E FL (ZAPM09302, 2001-)
- Vespa (Piaggio) PX 150 E FL (ZAPM09400, 1998-2000)
- Vespa (Piaggio) PX 150 E FL (ZAPM09401, 2001-)
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