Vespa PX150

I have an 05' Vespa PX 150 with a Polini 177 kit installed and a Dell Orto 24/24 carb. I just bought it and it's very difficult to start even after cleaning the jets in the carb and installing a new B7HS spark plug. It takes normally about 45 seconds to start it up. Firstly, is this the right spark plug to use on a 177 kit?

The engine compression is also approximately 130 psi. Any help would be greatly appreciated. Thanks. 



Hello Junopete,

we think that the idle jet is to big.

Maybe you can try the original one of your SI 20/20 carburator.


Kind regards

Mario SIP