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The original 650 had a stroke of 3.22 inches compared to the 2.68 inch stroke of the 790
Didn't the earlier generation use rocker arms? Overhead cams with shim and bucket valve actuation probably make the motor taller overall. Maybe that's why the stroke was shortened. Don't know for sure, just thinkin' out loud...
Yes and I wish we still had the rocker arms and solid tappets. A breeze to work on. Those old engines could sustain ungodly RPMs too, couldn't hurt the bottom end, could crank it until you floated a valve.
I learned all I need to know about life by killing smart people and eating their brains.
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