Has anyone tried the dyno jet kit but kept the factory main jet in place? I've tried the 2nd and 3rd groove on the needle with the #144 and #146 and the f/a screw at 3, 2 1/2, and 2 turns out. All kinds of combinations. Lots of low end and than it falls on it's face. Will jump my son's polaris sp500 by about 2 bike lengths off the line but after about 30 to 40 yards, he goes by me like I'm sitting still. Talked to a honda mechanic with some jet kit experience and he suggests useing all the jet kit but keeping the factory main jet. If that doesn't work I'll probably pull the whole jet kit out and go back to stock. He says that to get the full benefit from the dyno jet, you have to go to an after market exhaust, and I'm not going down that road.