If your running a 167.5 mikuni main
, I'd step that to a 172.5 mikuni main for the 1700. Back the PMS
out, to about 2, to 2 1/4, and try that. You can also bump the pilot
to a 40 mikuni, if you want.
I didn't like the way it ran, with the nut under the arm on mine. I put it back on top, and the screw is about 2 1/2 turns off the nut.
Backing the PMS out, may fix what ails you, but I would double check the main, and step to the 172.5 at least. The 167.5, is lean for the bigger 1700's, IMHO