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yz250f engine ???

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03 - 05 will work for sure.

I believe the 01 & 02 will work as well, but they do not have auto decompression (stock)

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I really do not know for sure but my 30 years riding Yamaha lets me think thay anything up to a 09 could be made to fit in a steel frame. The most important item is the location of the swing arm piviot

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an 01 or 02 engine probably wouldnt be a good idea as you would have no place to put oil in the motor , you filled the oil up through the frame on those years.

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Replace the side cover of an 01 & 02 with an 03-05 and you would be fine

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