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I was poking around Ebay and noticed a ZX9R engine for sale on there, real cheap. Got me thinking because the damn thing looks so much like my ZX6R's motor...not that I would ever do something so crazy, but I know some of you have done engine swaps, what is it that makes a bike/engine pair a good candidate? I've heard mostly about the ZX7/9 swap, that it's basically a drop in. Any others like that? Are there problems with frame stress and adding all that extra torque to a cycle not designed with all that extra horsepower in mind?
Just curious...