I have an Arreche 19mm on my 70cc kit. For an 85cc I think you would need a 21mm. I have heard good things about the Delorto, Mikuni, and Oko. My Arreche seems to be a very nice one, but I'm just a little frustrated with trying to get it tuned right. I have heard the others are a little easier to get dialed. The Arreche is very easy to make adjustments too, on a positive note, I'm just tired of having to do it! I'm sure it would be the same with something else though.