Completely undecided, the 1314 kit looks intriguing, but the first overbore kit looks safer. Not going to even consider the 12:1 pistons, I think those are for the Legends Racers who don't mind rebuilding every year. So far it looks like the standard Wiseco kit will come in a couple of hundred bucks cheaper than the Yamaha OEM parts, that goes quite a way to paying for the rebore. The big kit requires resleeving and engine case machining, so more bucks there.