Polini 210 cc alloy kit tested on our P4 dyno jet

Today we had the new Polini 210 cc kit on our dyno. Bast brought his Vespa in for testing. Despite his highly tuned Smallframe and Lambretta scooters, he just purchsed his first Largeframe Vespa. The very soon fitted P200 engine was not was he was looking for to use it for touring and Rally going. So the new Polini was his kit of choice.

There was nothing altered on the P range engine. The 57 mm stroked standard crank and SI24 (re-jetted) left untouched. Nothing was grinded or ported. A new exhaust was fitted. One of the SIP Road ones.

Right out of the box the Polini kit gives suitable port timings for fast road use. We had 123° transfer timing and 171° exhaust timing. The 24° pre blow down timing gives a nice and broad power spread and should result in a nice fuel saving engine.

Upshot: Good priced Plug & Play power for fast road use. And with larger carbs, expansion exhaust system and additional porting and matching of transfers there can be found even more power.