Need help. Since I had a cold sieze on my 00 KTM 300 last year and need my cylinder bored and sleeved or re-nical'd anyway, I'm looking at more power while I'm at it. Big Bore? What's the biggest bore I can go with a 300, 310? I was also wondering if anyone knows if it's possible to put a 380 cylinder and piston on a 300 bottom end? What would it entail? My local dealer said it should bolt right on but they didn't know about case porting or what else might need done to make it run right. Could Eric Gorr's shop pull it off? Looking at the prices so far a bore sleeve and port job is going to be about $500 if I can do the 380 swap with port and other mods it might entail for under $1000 I'd seriously think about it? Any comments welcome.