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450 into 250 frame?

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I have an 04 KX 250F and I have an opportunity to buy a complete KX 450F engine. Will it fit into my frame? The 450 is an 07 with 15 hrs on it.

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Imagine if it was possible ... that'd be a rather significant change in power output.

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oh come on now! of course it's possible....just not a bolt on power mod.

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Define "fit".

It will not bolt in, but with some measuring, cutting, welding heat treating, and fitting bigger radiators it will "fit".

Get a 450 if you want it´s power. Just because an engine can be purchased doesn´t make it a good deal.

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I would have to agree, you will be better off buying a 450f complete bike then trying to retrofit the motor in a 250f frame.

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