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Hi everyone, 

        So I recently purchased a 2001 YZ250 with no Engine. I am looking to make it in to a single track enduro bike. I am right now looking for some what of a complete engine and have come across one recently pulled motor out of a 2011 yz250. To my knowledge the only thing different about the motors from pretty much 99-Present is the swing arm pivot. I guess they changed sizes in 02. I was wondering if anyone knew if it is possible to interchange that 2011 engine into an 2001 frame?

Thanks! 

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4 hours ago, Bigbenny54 said:

Hi everyone, 

        So I recently purchased a 2001 YZ250 with no Engine. I am looking to make it in to a single track enduro bike. I am right now looking for some what of a complete engine and have come across one recently pulled motor out of a 2011 yz250. To my knowledge the only thing different about the motors from pretty much 99-Present is the swing arm pivot. I guess they changed sizes in 02. I was wondering if anyone knew if it is possible to interchange that 2011 engine into an 2001 frame?

Thanks! 

Yes and the easiest way is to change the collars on the swing arm bearings to accept the 02 up pivot bolt, and drill out the frame holes to match. It's 1-2mm difference is all,  and the pivot collars are same OD, with matching swing arm bolt ID. 

 

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...or replace the swingarm pivot collars in the 2011 motor with collars from a 1998-2001 engine. Then you could just bolt the motor in.

https://www.partzilla.com/product/yamaha/90387-1712Y-00?ref=13555dc1d8337581cb3aebd29ac2c40f74aef321

https://www.partzilla.com/catalog/yamaha/motorcycle/2001/competition-yz250n1/crankcase

...but good luck finding those collars. It may be easier to have a pair made at a competent machine shop. Use the 2011 collars as reference.

Good luck, and keep us updated with what you do. :thumbsup:

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Maybe contact TT member Connor Tracy in this thread...

He's considering putting a 2001 motor in his 2003 frame.

You guys could swap engine collars and make your engine swaps happen. :thumbsup:

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28 minutes ago, CaptDan said:

Maybe contact TT member Connor Tracy in this thread...

He's considering putting a 2001 motor in his 2003 frame.

You guys could swap engine collars and make your engine swaps happen. :thumbsup:

Awesome thinks so much!! I’ll try and reach him and see if we can make something work! I’ll keep y’all updated and start getting pictures uploaded 

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Here are some pictures! Using the old trusty 5 gallon bucket stand cause my other ones are being used haha 

0A784D59-5116-49AD-A9D2-21AFFDF5A807.jpeg

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