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Will 05+ motor fit 03-04 kx250?

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I believe the only really significant difference is the head stay. The dimensions of the bottom-end are the same. Of course you'll run into some issues with the pipe, as I believe the '05 and up uses a different connection at the engine.

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The engine is designed differently and sets more upright. Look at some pictures of the bikes and you may see the difference.

THe 2005 and newer DO use a different connection, with no o-rings on the outside, like it had been for years.

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the 2005 motor will fit but not with the same mounts 05 was the year they redesigned the KX case to carb.

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Dont know if this will make a differance, but the 05 up KX frame is an inch narrower at the foot pegs.

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I know it won't fit into a 125 frame less you have a spark plug that comes out the side of the head

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