assuming your set up has all right componets lined up, pump size, nossels, correct high seed jet. remember your barrel valve controls the idle richness, there is also an idle pop of spring usually, but your barrel valve will make idle fat or lean. On cold start sometime you may want to lean out this after inital start to warm up motor some guys will adjust manual shut down valve to do this. After it is warmed up you want to lean it out, you may have to back down idel set to lower rpms, untit it does not stuble on throttle wack, if it stumbles, make it fatter. fuel injection is kinda like making love to woman you have to make it happy and the benifit are there. On other thing you might consider if you can run electronice or transbrake, put a throttle limiter in the linkage that engagen when trans brake is applyed, set to desired stall rpm. Get on that has a adjustable air bleed so on release it will open throttle as fast or as slow that you adjust that air bleed. Much easier on converter and you wont blow tires off on bad track condition. You main jet controls the high speed side, forget high speed by pass until you get it prety well dialed in.