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the XR80 and XR100 bottom end the same?

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I was wondering if anyone could tell me if the xr80 and xr 100 bottom end and head the same. form what I have found they both have the same stroke just a different bore. Any help would be great Thanks

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Bottom end is different, 80 head has a smaller combustion chamber for higher CR.

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you can use a XR80 head on a XR100 they are pretty much the same the 80 has a tiny bit smaller combustion chamber. The bottom end is a different story it is pretty much completely different the cases are different the crank is different the cylinder is different the transmition is different but it will fit a XR100 the clutch is also different.

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