Crankshaft -MALOSSI (reed valve intake) 60mm stroke, full circle web- Vespa PX200, COSA200

Malossi PX200 Crankshaft – 60 mm Stroke for High-Performance MHR Engines

For the very first time Malossi dares to offer crankshafts for large frame engines.
The dimensions of all PX200 crankshafts are the same as those of the 125cc models. From a technical point of view, this means that the crankshaft drive is already fully utilised with the original 12 hp cylinder.
The narrow crankcase of the PX models does not allow the use of wide crank webs (urgently required for high performance). To develop a crankshaft that can withstand over three times the power (Malossi MHR cylinder) is therefore a more than technical challenge.

For a crankshaft that is as stable as possible, the crankpin and its material coverage should always be as large as possible. For this reason it is noticeable that Malossi has reduced the pin diameter from Ø22mm to Ø20mm and the crankshaft diameter from the original 97,8mm to 95mm.
Presumably to have enough cross section for the diaphragm control, which is absolutely necessary with a full cheek, even at high rpm for a corresponding amount of fresh gas available.

• Fitting for: PX200, Cosa200
• Material crank webs: 18NiCrMo5
• Stroke: 60mm
• Connecting rod length: 110mm
• Lift pin: Ø20mm
• Crank web diameter: Ø95mm (both sides)
• Connecting rod foot width at the bottom: 14.8mm
• conrod thickness: 5.6mm
• crank web width at the crank pin: 11mm