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Engine case with diaphragm intake compatible with your Vespa P 125X, PX 125 Lusso, PX 125 MY, P 150X, and PX 150 MY scooters.
This completely redesigned housing is designed to replace the original Piaggio engine housing and remains compatible with original Vespa components. Instead of the classic rotary valve intake, this engine block uses a flat diaphragm system. This helps resolve issues caused by worn intake gasket surfaces and allows for the installation of a racing diaphragm block with a 28/30 mm carburetor. The standard SI carburetor can still be mounted on the block, including the version with separate lubrication.
The housing halves are numbered in pairs and machined together to ensure that bearings and sealing surfaces fit together perfectly. The flow patterns of the crankcase and overflow ports have been optimized using CFD simulation. The swingarm, the transmission area, the shock absorber mount, and the cylinder base have been reinforced, creating a stable foundation for powerful street engines as well as race setups.
On the clutch side, a ground steel flange supports the bearing. This design also prevents the shaft seal (commonly known as a Simmerring) from migrating out of place. On the ignition side, a larger bearing measuring 25x52x15 mm is used. M8 hex head screws replace the traditional M7 through-bolts and make the housing assembly stiffer. The motor housing is made of heat-treated Al Si10 Mg T6 aluminum alloy and is designed for an electric starter. The offset gear oil filler neck increases the oil capacity and improves lubrication within the gearbox.
The silent blocks are pre-installed. In addition to the two housing halves, the package includes all small parts required for assembly. The shaft seals and bearings are also included.
You can find the matching clutch cover and cylinders in the accessories section.
A quality product from the Italian manufacturer Polini.
| Manufacturer | Polini |
| Material | Cast aluminum |
| Ignition type | Electronic |
| Total length | 420 mm |
| Height | 345 mm |
| Width | 320 mm |
| 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 , PX150 · ZAPM742 · 2001 Model Year Catalytic Converter |
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