Here's some XS650 goodness. This guy has it going on!

I can't wait to get mine done! Rephase means the timing of the crank rotation is changed. In stock form the crank is set to have one piston at top dead center, and the other piston at bottom dead center. With the rephased crank, one piston is at top dead center, and the other is at mid stroke. The result is a smoother running motor that responds to throttle changes much quicker. Now I just need to find some time to finish it up. I hope to be popping wheelies by spring time.