My son has a Clipic 50 trials with what is thought to be a minori( this is probable spelt wrong)engine. I have changed the barrel for an 80cc barrel and piston and it has given it more power. I had trouble originally getting it out of 1st gear before but now 2nd is a usable gear but still very underpowered , im looking at upgrading the carb but not sure what to look for. Any help would be great thanks.

Bigger jets to give it the right fuel air ratios

thanks for the reply but the carb i have is fixes with no screw in jets as far as i know. there are no mixture screws either .

Some scooters use the Morini engine and there are a large number of performance options for scooters. You could try the carb size that came on the Fantic 80 (16 - 18 mm?)

http://www.dellorto.co.uk/merchandise/products.asp?CategoryID=2&PartsectionID=20

http://www.psntuning.co.uk/scooter_category.php?cat_id=397&sec_id=D

thanks i think i will call the tuning company in your link and ask there opinion as i know it makes a difference how the engine is tuned .ie for a road bike,racing or in this case trials.There seem to be so many variations .