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Message: [QUOTE="biglou, post: 989815"] I'd go leaner. I think the 250F's have an accelerator pump like the 450's do. It squirts a stream of fuel down the intake tract when you twist the throttle. A rich fuel screw can compound this. Run it all the way in, and back it out 1.5 and go from there. A Zip-Ty fuel screw won't change anything, just make it easier to adjust (and they are worth the money, IMO). Another note, don't gage throttle response of a 4stroke on the stand. All of mine had some sort of stumble at times on the stand, but ran fine on the track. Go by how it performs when riding it. And roll the throttle on when reving it on the stand. Get the R's up a bit, then blip it. It should respond that way. [/QUOTE]