Tuning Kit SIP VMC 125 cc SPORT "Legal"

Tuning kit for legal conversion to 125cc of Vespa Smallframe models.

The 125cc capacity class is traditionally a very popular class, as it serves among other things 16 year olds as an entry-level class for individual mobility. In some countries, two-wheelers with 125cc may also be driven with a car license. Since 2020, there is also a regulation in Germany that allows holders of a car driving license to expand their license with a few driving hours to 125cc two-wheelers. For many a good reason to convert their Vespa to this capacity class.

• First certificate that converts 50cc vehicles to 125cc!
• Powerful cylinder from VMC
• Large scope of delivery incl. crankshaft, exhaust, carburetor and ignition

To create a certificate for the conversion from 50cc to 125cc is unfortunately not easy. After 1.5 years of testing and research we have managed it in cooperation with our partner at the GTÜ. With this kit it is possible to register a 50cc Vespa Smallframe officially as a 125cc. Of course, it is also possible to equip 80-125 Smallframes with this kit road legal.

Engine update with TÜV blessing. The easiest way to make the scooter legally faster.

With the parts approval kits we offer you the pearls of our years of tuning experience now Road-Legal by all-round carefree packages for entry in the vehicle documents. The kits not only save time and nerves, they also reduce the costs incurred during registration enormously. They provide a secure basis for registration without any problems with the inspection authority. After that, the scooter is legal, safe and fast on public roads.

The cylinder

The core of the tuning kit is a powerful cylinder from VMC. It offers 125cc displacement, combined with a very modern cylinder layout. The 6 channels have a modern layout and large cross sections. The head is 8-bolted, and a high-quality flat piston with 2 piston rings is used as the piston.

The technical details at a glance

• Cast iron cylinder - bore 55,6mm
• Capacity 123,83cc
• Stroke 51mm 
• 6 transfer ports 
• Flat piston with two piston rings 
• 8-fold bolted cylinder head 
• Incl. 5 foot gaskets

• Recommended spark plug B9ES

• Ignition timing 19° before TDC

What is included in the kit?

The kit is extensive and includes all parts that are important for the power delivery of the engine. From the carburetor to the crankshaft to the exhaust. The vape ignition is also included in the kit. It delivers the required current particularly reliably and powerfully. It also fits the VMC GS cylinder without modifications. This builds a little wider. Therefore, not only must the dust ring on the engine case be removed, a modified pole wheel must also be used. With the Vape this problem is eliminated.

Scope of delivery

• Cylinder
• SIP Road Banana / Polini Banana
• Crankshaft
• Primary gear ratio 2.56
• Piaggio air filter
• Intake manifold
• Carburetor SHBC 19.19
• Vape ignition
• optional according to certificate SIP engine case:
• - Vespa 50-125/PV/ET3 24303000
• - Vespa PK50-125/S 24303000
• - Vespa PK 125 ETS 24320000, 24302000, 24302B00
• - Vespa PK50-125/XL 24310000, 24301000, 24301B00

Conclusion: with this kit a 50cc can not only be legally converted to 125cc, the scooter can also boast modern driving performance after the modification.

Attention: Before mounting the cylinder, the ring-shaped part of the jam protection on the engine block must be removed, which stands over the cylinder sealing surface. It would collide with the large overflows of the cylinder. Also, an original fan impeller will not fit in this location.

The best setup - our SIP TIP:

• Shock absorber SIP PERFORMANCE 2.0
• Brake shoes SIP PERFORMANCE
• Cable kit SIP PERFORMANCE