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.