Good Taste in Bikes and Chicks NTRYDR! I have had two 1979 GS1000s (one now, hot rodded up, including an 1100 2V Head, Mikuni Vac Carbs, Weisco Big Bore Kit, and V&H Pipe), and my still fine 2001 Busa, hot rodded up a bit. Also a couple or three GS750s, and my original bike was a 1975 Yamaha RD350, stock but with some gum soft Michelin Race Tires!
I was told a local "machine shop" tried to bore this cylinder. Brought it to me to see if I could save it. Nope, they hogged it out so far, there are no over sizes left. Well none for the bottom half of the cylinder, top half could be used. It would probably run a bit rough. I heard they broke their boring bar doing this. Most likely took too big a bite. I would have loved to hear the noise the machine was making. It's probably a 4mm step!