man a typhoon125 can fly if you want! It's got the famous 125cc Piaggio engine and there are a lot of parts for it. Of course you can put a runner180lc engine on it, but if you want to keep it aircooled you can let it go fast using:
-Malossi 172cc kit/Simonini 180cc kit
-Malossi MHR pipe/Polini Evo etc
-Polini Big valve
And you've got to modify the carters wel. If you tune the 172 cilinder you could go faster than some 500cc maxiscoots (X9 etc) in acceleration...