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Looking for more power

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I have a 2008 wr250f and I am looking to get more power out of it. I have a full fmf pipe and I believe it has stock jets in it which need to be changed. I have done some of the free mods. Fmf snap. And FCR suspension.

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Besides proper jetting, I think all you can do now is big bore.

If I were to purchase a big bore kit would I need to change jetting or change valves or crank or any thing of that sort. And does that drastically hurt engine life?

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Jetting for sure. The rest, not positive. Have no personal experience with big bores. I would assume not, and I doubt it would drastically hurt engine life. Maybe marginally.

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I asked JD himself this question when I was planning to put a 269 bb on my 11' WR. He told me to just raise the needle clip one clip to lean it out a touch. Leave the jetting as is. I was planning on the cylinder works bb but sold the bike to get an FX.

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