BGM031120G Crankshaft -BGM Pro Touring (rotary valve) 57mm stroke, 105mm conrod- Vespa PX125, PX150


Product Description

Like in the good old days at Piaggio, the bgm PRO crankshafts are forged. The forging process gives a much higher density to the material. So you gain a better thermal coefficient and a much stronger material. Like known from the WIESCO pistons. Beside the crank webs the con rod is forged as well and afterwards CNC finished. There is no doubt about the lubrication and bearings of the crankshaft. The lubrication of the big end pin is by two large slots and four additional pockets at the side. The SSC racing bearing and the two fat shims make it a very solid construction. For the lubrication of the small end bearing there are two holes at the small end. The delivery contains a INA small end bearing. The crankshaft is available with longer stroke 60 mm and standard stroke 57 mm. The long stroke gives not just more cc, it enables you to set the port timings of the transfers and exhaust more freely. Give us a call or sent us an email for the perfect match of crankshaft and cylinder kit. The bgm PRO Racing crankshaft has a much better inlet design than any other crankshaft: The inlet timing of the standard crankshaft is not suitable for tuning purposes. The timing is too short and once you reach a certain amount of revs, the inlet timing will close off. The commonly available Racing crankshafts do have longer inlet timing, but the inlet is opened too long after top dead centre. A massive engineering problem that gives heavily blowback, bad low down and mid range powe…

  • Item number:  BGM031120G
  • Availability: in stock (please check current availability here)
  • Brand: bgm Pro
  • State: NEW
  • Weight: ca. 1,95 kg
  • Category: Scooter Parts > Spare & Tuning Parts for Vespa, Lambretta, Scooter, … > Vespa > Engines > Crankshaft
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