2003 450 interchangable with 2005 450???

Was wondering if a 2003 yz 450f motor would fit in a 2005 yz 450f?

Yes it will, all the mounts are the same.

Thats all i needed to know thanks!!!

Those two engines are externally identical, and 100% drop-in interchangeable. The ignition mapping on the '05 is milder, and the '05 has a slightly better head. The '05 also has a higher primary gear ratio. The difference is exactly what you'd get if you went up a tooth at the front, or dropped 3 at the rear.

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