this is what i know. I bought it off a member here, he said it was a graydon proline, I traded for it and now i want to go back to duels for a bigger motor. I had to do a bunch of jetting and needle changes to get it correct and have done so, I will throw in the "stock" needle that came with it as well as the one i bought, ill throw in a brand new throttle cable and thumb throttle as well as a k+n that is on it with a outerwear. for 150 shipped.