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'84 xr350r motor into a '84 xr250r

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Any one have any idea if it would fit without too much trouble? Part numbers for the frames are different, but I didn't know if it would fit without too much modification. Thanks in advance..

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Never heard of it being done, but as many have said on this forum, nothing is impossible if you throw enough time & cash at the project. I'd start with a tape measure.

I've often wondered the same thing on the later model XR400 & XR250, but don't think you'd gain much if anything for your efforts.

Let us know what you find out.

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I dont think it will easily fit. The 250 was based on the 200 frame rather than the 350. I think the 350 motor will be too tall. Measure and see.

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It definitely won't go. A friend had an '83 xr350r when I had my '86. The motor is physically much larger - I think in all dimensions.

- jeff

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