WELCOME ! Without knowing your specific issue, a good place to start is roughly 2 1/2 turns out. If you have a modified air box, pipe or any jetting changes, the 2 1/2 turns might not hold true. Elevation of your location plays a big part of the equation too. If you post a bit more of your information, ie was there any mods, your location etc. some better advise might be of more help. Greg
If you haven't done a search for this on the site, that may be helpful.
Also see
http://www.ttr250.com/#Carburettor
-- Edited by texasT on Sunday 13th of March 2016 05:01:09 PM