I cleaned my carb and i put a 150 main jet, at the begining the bike was running ok, with a little tuning of the idlle and mixture screw. after i stop for 2 hours, when i left the trafic light, it wouldn't accelerate properly, i mean from half throtle till full throtle nothing happens,the bike doesn't pull.
what 2 do?

ok! i went back in .... it was the moped setings ..... my slider  was stuck down, i couldn't lift it with my fingers so i used two screwdrivers and open it...  cleaned again with a sand paper and i put just an ideea of wd40 on my fingers and then on the slide and on the carb where meets the slide. i will report if i will have problems with this fix ...
guys, feel free to advise me with some cleaning products for the carb
thanks

I wouldn't recommend sanding unless it's a super fine grit... 000# steel wool is better... clean is key...
It should move silky smooth, with only the spring and diaphragm resistance felt.

Na,... I'm sure it's fine....  
I didn't say never do it,... I just said I wouldn't recommend it.