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03 to 06 swap

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wondering if an 03 YZ 250 motor will fit in an 06 frame? and what else might need to be changed?

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Pretty sure it will. Do a search as there are a few on here that have done frame and engine swaps between the steel framed and aluminum framed bikes.

Think you will need to use an 05 or newer pipe as the steel frame pipe won't fit around the aluminum frame. However, many aftermarket pipes are designed to fit all YZ250's 99 and newer.

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there is a thread in the faq regarding a guy who did a steel to ali frame swap and took lots of pics :bonk:

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'03 engine is the same as the '06. Will bolt right in. Not sure about the pipe issue.

The swingarm pivot bushings are different between the steel frame and aluminum framed bikes engine cases.

You should be able to press the old one's out and pop in the new ones.

Bad part is, you can't buy just the bushings.

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The swingarm pivot bushings are different between the steel frame and aluminum framed bikes engine cases.

You should be able to press the old one's out and pop in the new ones.

Bad part is, you can't buy just the bushings.

Ohhhhhhh. Oops, sorry. I never considered that.

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