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Switched from Pump Gas to VP Ult. 4...jetting thoughts??

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I have a 2005 KX250f which ran fine on premium 94 octane. Switched to VP Ulitmate 4. Power is noticeably better, but bike is bogging and cuts out on top. Elevation is 4100'. Any help would be greatly appreciated.

Chris

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if that's one of them there oxygenated fuels (it is, i checked) i'm guessing you should jet a little richer to compensate for the extra oxygen.

mw

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if that's one of them there oxygenated fuels (it is, i checked) i'm guessing you should jet a little richer to compensate for the extra oxygen.

mw

I read that oxygenated fuels require larger jets. maybe a couple sizes bigger.

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I go one size bigger on all three (pilot, needle clip, main). That usually works well.

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