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Crf250r engine 450 frame

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Good day I am new to the site and this is my first time at anything like this so please be easy on me. Ok long story short I have a 2002 Honda 450r that's all in parts frame and engine not together. I also have 2008 Honda crf250r complete running engine but no frame. I would like to know if the 250 engine would fit right on to the 450 with out to much modifications? Thanks in advance.

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Probably you will have to make new engine mounts but of course is possible. People put from 125 to 500 2 stroke engines in a 4 stroke frame so I don't see why you can't do it.

Thanks I was thinking the same thing it shouldn't be to much of a problem being its the same model of bike

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It's a completely different frame. Take a look at the lower main frame and airboot area to see what I mean.

You'll have to do a whole lot of custom aluminium fabrication to make it fit.

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