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xr400 jetting question

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I have a big gun exhaust and header and stock jetting on my 03 xr400:confused: I have tried re jetting but the bike runs the best on stock jets. I have tried a 52, 55, 58, and 160. If I run the stock jets will it hurt my motor?

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Well I removed the snorkel and put in a 160, and 58 😢 Well with the big gun header, big gun exhaust and those jets I now have a kick butt XR 😢 It's a whole new bike with loads more power than stock 😢 Thanks for the help and the free mod info!

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