Re: Vespa Exhust+air filter+upjett - question
Sounds to me that you put a huge expansion chamber on a stock 49cc top end with a tiny 12mm SHA carb. You will never hit the power band and it's going to suck balls on hills with that pipe unless you go big on the top end and carb/intake, which in your case, you would need new racing cases or be a good fabricator... You would have been better off with a circuit pipe...
You ARE probably running lean, but you will still never hit the powerband of that pipe with everything else stock...
I was running a proma circuit on my Grande with a modded airbox and I want to say my main was at 68 or something... Start at 70 and work your way down. It will have more power if you are jetted correctly, but that is too much pipe for your setup imho...
Hope this helps.
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