the 250R probably has a counter balancer, i think. not really sure. if your thinkin about puttin a cr250 engine in your 300ex frame you can make it work but it will vibrate a lot. there was something like that in one the the magazines a while back.riginally posted by racin 400 a cr250 motor is gonna go in my R frame when i get it.Or i just gonna put a yz426:blah Go with the YZ426 swap, you'll be happier with the result, especially for MX. Originally posted by racin 400.
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