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What year engines will fit 84 CR250 frame?

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Hi guys,

Just picked up an 84 CR250. I need to know what other years of engine will fit in this bike, if any. Can anyone help? I've been searching all night and can't seem to find any info.

Thanks,

Colin

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I think 84,85 are the only similar years. 84-91 might share similar cases so the bottom ends might bolt in to the 84 frame, the cylinders were very different so those mounts would likely be different.

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In that case, how compatible are the engine components? Will an 84 top end fit on a newer crankcase? The engine that came with the bike is a basket case, the bottom end needs serious work. I found an engine out of an 88 and I'm wondering if it will be of any use to me.

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The bearings and whatever in the 88's bottom end would probably work to replace most in the 84's, most everything else is different. The cylinders will not be interchangeable.

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I found another basket case, this one's an 86. I think the crankshaft and bearings are the same, not sure about the other internals. So I guess that I should be looking for an 84-85 engine? Are they interchangeable?

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