Cartman is right. His 4 on top, middle flush, and somewhere between 2.5-3 turns out on the bottom. I came up with 2.75 turns out on mine, but I have a MR-12 not a MT-12. Do that trick where he tells you to open the throttle all the way. Now my motor is too fast for my own good. I might be backing off the centex to engage earlier to make it a bit easier to control.