Convert Vespa PX80 to 125cc - with TÜV - all information - all parts here

Easily convert the Vespa PX80 to 125ccm - this is how it works:

The vehicle prices for the Vespa PX models have been rising for years. The cheapest models are still the Vespa PX 80 / PX80 Lusso. The 80s Vespas have the least performance and are rated the most expensive by insurance companies. When converting to 135ccm or 139ccm, the scooter can no longer be driven with the 125cc driver's license. Here we show you how you can easily convert a PX80 to a PX125 without having to work on the crankshaft or the gearbox:

Cylinder -SCOOTER CENTER Conversion cylinder Vespa PX80 to 125 cc- Vespa PX80 / PX80 Elestart

TÜV registration possible! TIP: Suitable for Elestart engines without modifications!

Advantages of retrofitting:

• more performance and safety reserves in road traffic
• less consumption approx. 20% according to customer experience
• Can be driven with an old 125 driver's license
• cheaper insurance
• same durability
• easy installation

We offer you a complete cylinder kit to bring every PX80 plug & play to 125ccm displacement.
If the kit is registered with the TÜV as an individual approval, you can use the significantly lower insurance rates of the 125cc models benefit. All you have to do is change the cylinder, including the piston and head, the short motor remains unopened!

More performance - less consumption

Originally the 80ccm engine has about 5HP on the rear wheel. With our conversion cylinder, the performance increases by a whopping 60% to a remarkable 8PS and that with extreme reliability. This means that the performance of the cylinder is already in the range of a 135 DR. In this diagram you can see a direct comparison between a 135 DR tuning cylinder (blue curve) and the SCK 125cc conversion cylinder (red curve). In connection with an extended transmission (possible by simply changing the clutch pinion to 22 teeth), the top speed is also significantly increased. The significantly wider torque curve means that the gears no longer have to be fully accelerated, and consumption is reduced.

Performance Graph 125cc Conversion Kit vs DR135

Are the brakes and frame overloaded?

No, with the conversion kit you are on the safe side - the Vespa PX80 has the identical brake and chassis components like a Vespa PX125 and even a Vespa PX200, which is / was available from the factory with 12PS.

Durability of the cylinder

The durability is at least as good as the original cylinder: almost indestructible. Two, with prototypes of the Scooter Center In 2011, vehicles equipped with conversion cylinders were on the road for several thousand kilometers without problems or breakdowns. The drivers are from the Performance and low consumption simply enthusiastic.

5 star rating of Bernd:

Rating in Scooter Center Online-Shop

Recommended motor settings:

• Main air correction nozzle: 160
• Mixing tube: BE3
• Main jet: 102-108 (start big)
• Idle nozzle: 52/140
• Spark plug: W4AC or NGK B7HS
• Ignition timing: 19-21 ° BCE

optional:

• bgm BigBox Vespa sport exhaust
• bgm BigBox Vespa Touring exhaust
• bgm Shock absorber Vespa PX with TÜV

Video about the Vespa PX80 - PX125 conversion cylinder

TÜV certificate and Piaggio approval

Unfortunately, it is currently not possible to deliver this cylinder with a TÜV certificate.
The technical and formal hurdles for such an expert opinion are now so high that it is not economically feasible (the selling price of the cylinder would then be much too high).

The Vespa PX80 has the same brake and chassis components as a Vespa PX125 and even a Vespa PX200!
It is therefore possible to have one official approval from Piaggio you can get it Request online HERE. This is made specific to the chassis number, so a mere copy is not enough.
The TÜV then has the working document in black and white that the PX80 also has the same brake and chassis components as a PX125 (or even PX200). Equipped with this, the engine that has been converted with our cylinder can then be demonstrated. The official Piaggio document usually opens doors and gates.

Possible tuning measures

"Stage 1"
If you want to elicit more power from the cylinder, you can turn the cylinder by approx. 1mm on the head sealing surface.
The crush dimension (distance piston to cylinder head) should then be approx. 1,1mm at the narrowest point. Simply push 2mm solder through the spark plug hole into the edge area of ​​the combustion chamber and turn the crankshaft.

"Stage 2"
If you want significantly more power and torque, you can easily achieve this with the original cylinder head of the PX80. Due to the smaller combustion chamber, the compression increases again significantly and the power / torque increases by at least 1PS / 1NM. For this, however, the distance between the cylinder head and piston should also be checked (at least 0,8mm) to avoid mechanical damage. The sealing surface of the cylinder head protrudes into the combustion chamber of the cylinder. This is only an optical shortcoming, technically this solution is completely unproblematic. .

"Stage 3"
Furthermore, the outlet window can be widened 1mm on each side. With these measures, the cylinder is already scratching the 10PS brand. With a lighter fan wheel we already have over 11PS and 13Nm is reached (see second diagram). The driving behavior is therefore very similar to an original Vespa T5. Individual adjustments to the jets and the ignition setting are then of course mandatory.