Barry Grant, preferably speed demons. I dont think they have an off road specific carb. But all their carbs a easy to tune, have special features found on the high level carbs from the other guys. They have smoother bores/venturis for better airflow and better power. And finally they look like a crown jewel on top of your powerplant. Best of all they arent super expensive.
On my maverick I went from a misbehaving street avenger to a 750 eddy, picked up a lil power decent enough, but didnt really scream, then I went to a 650 Mighty Demon and it "felt" like 40 hp. It honestly made my engine feel rauchous.
When I do up my 360 with all the goodies itll be a demon sitting on top of it.
The Last Great American Hero... the demi-god... to which speed means freedom of the soul.