Thanks I figured out the choke. I swaped out the entire thing, plunger and all. I did so by unscrewing it from the body via the 14mm plastic nut. I was under the impression that this was the BST31 carb found on the DR250 rather than the BST33 for the dr350. However micing the output orifice of the carb I get 1.296". That is pretty dang close to the 1.299 which would be 33mm. So you might be right.