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300 motor into a 2011 KTM 250sx?

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I have a 2011 KTM 250SX, My main bearings on my crank with out so i want to see my options before i take it to go get worked on. I race off-road and I'm always on the top end. I am getting a 2015 300 soon. Im just wondering if a 2011 300 xc motor well fit into my bike a 2011 250SX.


And if it does fit what do i need to get to make it the electric start too



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