Ttr 230X sputtering at top end

I just bought a 2008 ttr230 with no baffle. I purchased a powerful with a spark arrester, it runs well but has an issue of sputtering at 90% throttle. Do I need to jet the carb to account for the exhaust being open or do I have a lack of fuel issue?

Thanks

Purchased a powertip. Autocorrect!

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