You may want to put some teflon tape on the needles for you carb, that will help seal it up. Those carbs always pumped too much at the top, and not enough at the bottom, the high speed can be closed down quite a bit, and the bottom opened quite a bit. if your bogging off a turn, your lean, open it up. If you 4 cycle down the chute, lean out the high speed. Check the plug or head to see if your too rich or lean. You want a nice coffee color tending to grey. Grey is too lean, black too rich.
And clarify that it’s the Inlet needle (seat) that’s leaking.