Polini Vespa crankshaft Vespa PX125 Vespa PX200 NEW im Scooter Center

New Polini Vespa crankshaft

Polini Vespa crankshaft at Scooter Center arrived!
The brand new Polini crankshafts for the Vespa PX engines have just arrived.

Now available in Scooter Center Vespa shop. The is currently available Polini Vespa crankshaft for:

In detail

We took a closer look at the new Polini Vespa crankshafts for you.

First of all, the shape of the rotary valve cheek is striking. Here was a lot of material out of the way.

The relative is also noticeable strong cutwhich ensures a very quick intake closure and does not propel mixture out of the crankshaft housing again via a ramp. In return, the window under the rotary valve surface has been carefully processed so that there is no excessive imbalance within one crank arm.

The PX125 and the PX200 Vespa crankshaft with 57mm stroke is equipped with a 22mm crank pin. The crank webs for 60mm stroke are connected by a 20mm crank pin to ensure sufficient material coverage.

The cutout on the rotary valve cheek determines the period in which the inlet is open.
On a current PX200 motor housing, we come to a value of 110 ° from above. up to 75 ° n.Ot.

Overall, you get a very sporty steering angle of 185 °.

With the PX125 crankshaft we were able to get the values 110 ° from top to bottom. and 63 ° nth with a Degree disc
determine.

Polini has not changed the width of the rotary valve surface and is based on the original at 17mm.

Polini advertises the crankshaft as “balanced”, ie balanced to minimize nasty vibrations.
Therefore, we first looked at the balance factor. As a test victim, the PX200

Use a crankshaft with a 57mm stroke.

On the roller block, the crankshaft oscillates almost at the 12 o'clock position.

The so-called balance factor allows conclusions to be drawn about the expected running smoothness.

If you would like to try something out with the balance factor, we have determined some values.

The translational part of the connecting rod weighs 60,25 grams

The pendulum weight, i.e. the mass that is attached to the connecting rod so that the crankshaft can be brought to a standstill in any position on the roller block, is 104,35 gr.