Hey all just made the switch over to the yamahas a few months ago and still researching what works and what doesn't. The current bike I'm racing needs a top end on it. That said I just bought a freshly rebuilt motor that was never ran that I'm disassembling and going over to be my national motor next year. It has a brand new GYTR in it which I am not going to use on my national bike, but my question is will it be fine to run over on my current bike which will become my practice bike after one more race? I'm not worried about making every last drop of power out of it, but in my research it seems these pistons were bad for breaking. Is that still an issue or were they every updated? Would you use it or do I need to just toss this thing in the trash? I'm not tight by no means, but hey I don't like throwing money away either if this thing will get the job done. Thanks guys.