wondering if anyone knows what causes the bike to bog and die when given full throttle. Only runs right choked, even warm. Unchoked, I can "nurse" the revs up, but not quickly. Float level? Clogged jet?

I set the air screws to 1.5 turns, and sprayed some carb cleaner in while running, but problem persists.

Seems too lean.....but the bike didn't run lean when I got it. What changed?

Any help.ideas most appreciated
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1993 NSR250R SE MC21
2010 KTM 990 SMT
2004 KTM 300EXC
1996 Honda XR250