SIP PERFORMANCE Tuning Kit for legally converting Vespa Smallframe models to 125 cc.
The 125-ccm displacement class has traditionally been very popular, as it serves, among other things, as an entry-level option for personal mobility for 16-year-olds. In some countries, 125-ccm motorcycles may also be ridden with a car driver’s license. Since 2020, Germany has also had a regulation allowing holders of a car driver’s license to expand their license to include 125-ccm two-wheelers after completing a few driving lessons. For many, this is a good reason to convert their Vespa to this displacement class.
- First certification for converting 50-cc vehicles to 125 cc
- High-performance cylinder from SIP PERFORMANCE
- Extensive package includes Crankshaft, Exhaust, and Carburettor
Unfortunately, obtaining a certification for converting a 50-cc vehicle to 125 cc is no easy task. After 1.5 years of testing and research, we succeeded in collaboration with our partner at GTÜ. With this kit, it’s possible to officially register a 50cc Vespa Smallframe as a 125cc model. Of course, it’s also possible to make 80–125cc Smallframes street-legal with this kit.
Engine upgrade with TÜV approval—the easiest way to legally make your scooter faster
With our parts certification kits, we now offer the best of our years of tuning experience as road-legal, all-inclusive packages for entry into the vehicle registration documents. The kits not only save time and hassle, they also significantly reduce the costs associated with registration. They provide a solid foundation for registration and enable legal, safe, and fast use on public roads afterward.
The Cylinder
At the heart of the Tuning Kit is a high-performance cylinder from SIP PERFORMANCE. It features a 125 ccm displacement combined with a modern cylinder layout. The 6 channels have large cross-sections and a contemporary design. The cylinder head has eight fittings, and the piston is a high-quality flat piston with two Piston Rings.
Technical Details at a Glance
- Cast iron cylinder
- Bore: 55.6 mm
- Displacement: 123.83 cc
- Stroke: 51 mm
- 6 overflow channels
- Flat piston with 2 Piston Rings
- Cylinder Head secured with 8 bolts
- Includes 4 base gaskets
- Recommended Spark Plug: B9ES
- Ignition timing: 17° before TDC
What’s included in the kit?
The kit is comprehensive and includes all parts essential for the Engine’s performance—from the Carburettor to the Crankshaft to the Exhaust. The VAPE ignition system and the SIP crankcase can be installed as optional extras and are also listed in the parts certification. Additionally, they fit the SIP PERFORMANCE cylinder without any modifications.
The cylinder is slightly wider. Therefore, on some models, the lowest cooling fin on the fan blade side must be machined. This problem is eliminated with the VAPE Ignition system.
The kits are equipped with a crankshaft featuring a 20/20 mm or 24/25 mm Cone. If an original engine with a 19/19-mm crankshaft is used, the Ignition must be converted to a 20/20-mm Cone.
What else is needed:
To perform the conversion, the studs for the cylinder and the Cylinder Cowling must be replaced.
Depending on the connection size of the Fuel Hose, a reducer may be necessary. Our recommendation:
Conclusion: With this kit, you can not only legally convert a 50cc scooter to 125cc, but the scooter will also deliver modern performance after the modification.
The best setup – our SIP TIP
