i have some tuning parts if your after some pm me if intrested and theres no point getting a bigger carb unless you get a 70cc kit
I had the phbg 21mm on my nrg extreme the black edition one, was a lovley carb easy to set up and sounded deep and made bike better, but you will need a bigger cylinder so get a dr70 imo
there "easy to setup" as there prittymuch set for a 70 with a pipe an filter.. jets a bit on the big side tho (92 i belive) good carbs tho just because you have somthing doesent make it the best tho remember, just makes you think it is
i have a polini 21mm carb on my aerox with open filter.. do u think this is to big? shall i get a 17.5 or 19?