Well i put my main jet in(180) and my air main blockoff plug in but couldn't get the two screws out to change the jet needle. I didn't have the size screw driver i needed and hope i didn't mess them up to bad where i can't get them out with the right size! What exactly does the jet needle do? I'm new to these carbs and am not sure but if i was to guess it helps let more fuel in to the carb? So i read in the manual that the original jet needle is set at the 3rd clip and that is what the dynojet kit said to set their jet needle at. Is there any difference in using the dynojet needle over the factory?