Polini "Tuning" crankshaft with a 57 mm stroke, compatible with your Vespa P 125, P 150, PX 125, PX 150, Cosa 125, Cosa 150, GTR 125, TS 125, Sprint Veloce 150, and Super 150 scooters.
This racing crankshaft is designed for rotary-valve engines and is precision-balanced to ensure your engine runs smoothly and quietly even at higher RPMs. With a 105 mm connecting rod and the appropriate threads and bearing seats (including 24/25 mm taper, alternator side M12x1.25), the tuning crankshaft serves as a robust foundation for a complete rebuild or if you want to upgrade your engine reliably. The valve timing is 138° / 5° after TDC.
You’ll find new crankshaft bearings, shaft seals (commonly known as Simmerrings), and an engine gasket set among the accessories.
A quality product from the Italian manufacturer Polini.
| Manufacturer | Polini |
| Material | Steel |
| Cheek type | standard |
| Crankshaft stroke | 57 mm |
| Thread type | MF12x1.5 (fine pitch thread), MF12x1.25 (fine pitch thread) |
| Connecting rod length center-center | 105 mm |
| Total length of crankpin on clutch side | 59 mm |
| Total length crankpin ignition side | 77.35 mm |
| Ø crank webs | 98 mm |
| Ø Connecting rod eye | 19 mm |
| Ø piston pin (B) | 15 mm |
| Ø Bearing seat (clutch side) | 25 mm |
| Ø Bearing seat (ignition side) | 25 mm |
| Thread length | 14.5 mm, 15.5 mm |
| Dimension needle bearing | 15x19x20 |
| Wide crank webs | 39 mm |
| Area of application | Tuning |
| Control time according to O.T | 138 °, 5 ° |
| Vespa | Vespa PX, T5, Cosa - P125X · VNX1T · 1977–1982 (Old PX) External Lock , P125X · VNX2T · 1981–1984 (Old PX) Internal Lock , PX125 E · VNX2T · 1982–1993 / Lusso / Arcobaleno , PX125 · VNX2T · 1993–1996 Classic , PX125 · VNX2T · 1997–1999 (Disc) , PX125 · ZAPM471 · 2001 Model Year Catalytic Converter , P150X · VLX1T · 1978–1993 , P150S · VBX1T · 1978–1990 , PX150 · ZAPM742 · 2001 Model Year Catalytic Converter , Cosa 125 · VNR1T · I 1988–1992 II 1992–1998 , Cosa 150 · VLR1T · I 1988–1991 II 1992–1995 Vespa Rally, Sprint, GT, GTR, TS, SS180, GS160 - 125 GTR · VNL2T · 1968–1978 , 150 Sprint · VLB1T · 1965–1974 , 125 TS · VNL3T · 1975–1978 Vespa VNA, VNB, VBA, VBB, Super, GT - 150 Super · VBC1T · 1965–1979 |
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