New
Hot 
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 sealing 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 housing, including the version with separate lubrication.
The housing halves are numbered in pairs and machined together to ensure that the 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 are reinforced, providing a stable foundation for powerful street engines as well as racing setups.
On the clutch side, a ground steel flange supports the bearing. This design also prevents the shaft seal (colloquially known as a Simmerring) from migrating out of position. On the ignition side, a larger bearing measuring 25x52x15 mm is used. M8 hex 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 to accommodate an electric starter. The offset filler neck for the transmission oil increases the oil capacity and improves lubrication in the transmission.
The silent blocks are already 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.
| Width | 320 mm |
| Manufacturer | Polini |
| Material | Cast aluminum |
| Total length | 420 mm |
| Ignition type | Electronic |
| Height | 345 mm |
| Vespa | Vespa PX, T5, Cosa - P125X · VNX1T · 1977 - 1982 (PX alt) Aussenverschluss , P125X · VNX2T · 1981 - 1984 (PX alt) Innenverschluss , PX125 E · VNX2T · 1982 - 1993 / Lusso / Arcobaleno , PX125 · VNX2T · 1993 - 1996 Classic , PX125 · VNX2T · 1997 - 1999 (Disc) , PX125 · ZAPM471 · 2001 MY Katalysator (Millenium) , P150X · VLX1T · 1978 - 1993 , PX150 · ZAPM742 · 2001 MY Katalysator (Millenium) |
Accessories & related products
VMC 63 mm cylinder kit "177 Stelvio 2.0" | Vespa Largeframe
Manufacturer: VMC · Material: Aluminum · Displacement: 177 ccm · Crankshaft stroke: 57 mm · Ø cylinder neck: 66 mm · Ø Outlet outside: 37 mm · Ø outlet inside: 34 mm · Ø piston pin (B): 15 mm · Outlet type: straight · Hole spacing outlet: 48 mm · Number of fixing points: 4 pcs · Decompressor: No · Camouflaged: No · Area of application: Tuning
435,30 EUR
VMC 63 mm cylinder kit "177 Crono" | Vespa Largeframe
Manufacturer: VMC · Material: Aluminum · Displacement: 177 ccm · Crankshaft stroke: 60 mm · Ø cylinder neck: 66.75 mm · Ø Outlet outside: 37 mm · Ø outlet inside: 34 mm · Ø piston pin (B): 15 mm · Outlet type: straight · Hole spacing outlet: 48 mm · Number of fixing points: 4 pcs · Decompressor: No · Camouflaged: No · Area of application: Tuning
405,80 EUR
Polini crankshaft "Racing" 57 mm | Vespa PX, P, Cosa, GTR, TS, Sprint V.
Dimension needle bearing: 15x19x20 · Manufacturer: Polini · Material: Steel · Cheek type: standard · Crankshaft stroke: 57 mm · Ø piston pin (B): 15 mm · Connecting rod length center-center: 105 mm · Total length of crankpin on clutch side: 59 mm · Thread type: MF12x1.25 (fine pitch thread) · Thread type: MF12x1.5 (fine pitch thread) · Total length crankpin ignition side: 77.35 mm · Ø crank webs: 98 mm · Ø Connecting rod eye: 19 mm · Thread length: 14.5 mm · Thread length: 15.5 mm · Ø Bearing seat (clutch side): 25 mm · Ø Bearing seat (ignition side): 25 mm · Area of application: Tuning · Wide crank webs: 39 mm · Control time according to O.T: 5 ° · Control time according to O.T: 138 °
294,10 EUR
Polini crankshaft "Racing" 60 mm long-stroke | Vespa PX, P, Cosa, GTR, TS, Sprint V.
Manufacturer: Polini · Material: Steel · Cheek type: standard · Crankshaft stroke: 60 mm · 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 piston pin (B): 15 mm · Ø Connecting rod eye: 19 mm · Ø Bearing seat (clutch side): 25 mm · Ø Bearing seat (ignition side): 25 mm · Thread type: MF12x1.25 (fine pitch thread) · Thread type: MF12x1.5 (fine pitch thread) · Thread length: 14.5 mm · Thread length: 15.5 mm · Dimension needle bearing: 15x19x20 · Wide crank webs: 39 mm · Control time according to O.T: 5 ° · Control time according to O.T: 138 ° · Area of application: Racing
305,80 EUR
New
Hot
Malossi 63 mm Cylinder Kit "MHR 177" | Vespa Large Frame
Manufacturer: Malossi · Material: Aluminum · Displacement: 177 ccm · Crankshaft stroke: 57 mm · Ø piston pin (B): 15 mm · Ø cylinder neck: 67 mm · Ø Outlet outside: 37 mm · Ø outlet inside: 33.9 mm · Number of fixing points: 4 pcs · Outlet type: straight · Hole spacing outlet: 55 mm · Area of application: Tuning · Decompressor: No · Camouflaged: No
511,70 EUR
Explore categories from Gearbox & housing (motor)
Working late? Evening hours on Thursday until 20:00
