Jetting wise if you have a day to play during setup take your suzi needles. They seem to work well in the Gassers too.
The W diameter with a 40/42 pilot has been reported to work well in 250's by myself and others, but all that is depending on the actual carb, and slide that you end up with in your bike. These results came with 38mm PWK ASII flat top/shallow bowl models with #7 non notched slides. If it were me I'd almost be taking my own carb, jetting supplies, and forks just to speed up the setup and reduce the amount of variables to deal with. Probably not so easy for you coming from the KTM though. Definitely take any needles you have around H/W/J diameters. N3CJ/N8RH etc along with your suzi ones, and if you have the jd kit thats not a bad fall back plan either.
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