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'05 250F Airbox

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I read in a magazine that the '05 airbox was what really gave the bike the extra power. I was wandering if the '05 airbox would fit into a '04 😢 Has anyone tried this and if so, what type of results.

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It will fit, and it will lead to better WOT performance.

But it's not the real boost contributer. The intake port was reduced in volume so the mix flowed at a higher velocity. For that, you'll need to buy an 05 head.

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It's actually the intake boot that connects the airbox to the carburetor that changed. It has a much smoother shape, more like a velocity stack now. I haven't tried it, but I'd bet it would fit perfectly on an earlier airbox.

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Sorry about the misword form box to boot.Thanks for all of the info. I am deciding between a '05 or an '04 plus maybe a 450 or 250 2 stroke.

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