I have a 1973 RD350 with DG expansion chambers, Y boot intake, boost tube, VAPE ignition and Mikuni VM28 carbs. I got it with a 170 main jets, 27.5 pilots and the needle on 3. I now have it with a 160 mains, 25 pilots and the needle on 3. It bogs down and stalls on takeoff (same thing it did when I got it). Elevation is 5000 feed. Does anybody know what I might need to do