Vespa pk50xl big bore kit?

[leepkxl]

Hello everyone it’s my first day and first post on this forum

My name is lee I’m 26 and I’m currently rebuilding my Vespa pk 50xl
This my first ever project. On the electrical side of Things I’m pretty confident with as I’m an auto electrician by trade, but the mechanical side I’m not the best at so what I would like help with is a big bore kit.


My Vespa pk50xl has the original standard engine in what bore kits can I get? And what will I have to change to make it work eg the exhaust and the carb? Any other bits?

If some could link me to something that would be great thank you very much and have a nice day

[jbcollier]

Welcome to the forum. The first question has to be, "What are you looking for?"

You're going to have to change the primary gears so that means you need to split the cases. If so, just fit the longer stroke crank at the same time.

Here's a configuration I have done for many people and they are always delighted:

- 51mm stroke crank
- Polini 130 kit (alloy is better but cast will do if $$ are short)
- 90/100 primaries
- 19/19 carb and manifold jetted as per Polini instructions
- Polini "banana" exhaust

It's a simple, reliable set-up that will out run a stock P200 and hold 90-100 kph no problem -- up most hills!