I was also thinking a leaky float but in all my years of working on carbs I have never found one that leaked.

I think I'll order new needle and seats anyways and just replace them when I inspect and clean the carbs. I don't want to have them apart and then figure out I need them.
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Andre E. Benguerel
1996 Honda NSR250R
Daijiro Kato/Fortuna Replica #74

2000 Honda RS250R (NX5)
2008 Honda RS250R (NXA)
AFM Expert #430