Description
A higher gear ratio will increase top speed. Only recommended for tuning / racing cylinders. OEM cylinders usually don't have enough power to pull this kind of transmission.
Gear ratio: 13/40 (3.07) => +13.3%
Shaft diameter = 17.7mm
Note: Piaggio changed their transmissions in 1996. The intermediate shaft between primary and secondary shaft was 18.0mm before 1996 and was changed to 17.7mm after 1996. In case you're not certain - please check the measurements!
This transmission is for models after 1996 with 17.7mm shaft.
Scooter gearbox
The transmission of scooters and some mopeds is located in a case behind the clutch and torque driver and has the function of reducing rpm and ultimately driving the wheel axle.
The transmission of a scooter has a direct influence on top speed. If the engine develops enough power and torque at low rpm, you can choose a longer gear ratio to achieve a higher top speed without any noticeable loss in acceleration.
Please note: if you don't have a press, better choose pre-assembled gears!
| Primary Gears Polini 13/40 Piaggio NRG after 1998 | |
|---|---|
| Article no. | P202.1378 |
| EAN | 8054705052613 |
| Weight | 0,41 kg |
| Brand | Polini |
| Product type | Transmission |
| Type | Primary |
| Assembly | Press-fitting |
| Gear ratio | 13/40 (3,08) |
