My gsxr750 ´95 has just gotten proffecionally fixed in the carburators and still its like the engine is having troble accelerating from 0 till round 4000 rpm. It sounds like its not going correct till it hits 3500 / 4000. The machine starts and goes like a dream in all other matters. I would like to ber able to shoot of from cero and alle the way up !! What may be wrong?