Stephen Hourd

Hi all, looking for some help please. To be honest it this relates to a Gilera that I have and is fitted with a Teikei 2 X 30 mm E30 PV 2A carb which I believe is used on some Yamaha singles from the past. I have fitted a ' performance ' exhaust and air filter, now runs as flat as the proverbial , no info that I can find on how to re-tune the carb to suit! Can anyone help please? Thanks Stephen