xl600

Hey guys, just have some questions about swapping a XR600 crank into my XL600R. Obviously there is a 5mm difference in stroke but as far as I can tell the rods are exactly the same, as well as the cylinder jugs. Can anybody tell me if the difference is actually in the crank, the head or the...

Just about finished, just want to see what people think?

Sorry not able to post here how do I del