80mm crank?

I was thinking about putting the 80mm crank from an xr600 into my 83 xl600r because like everybody else I want more power :cry: . This will give 640 cc's because I already have a 101mm Wiseco in it. I will be installing a WB cam and a XR's only exhaust. I was just wondering how you guys think this setup would perform.

You would have to make a 2 and 1/2 mm spacer for the bottom of the cylinder, I'd hold off on the cam as this mod will increase the compression ratio anyway

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