Specifically the "Baja" XR660 kit with the 9:1 compression. I don't want to fuss with race gas and in the Idaho hinterlands sometimes the only gas I can get is 85 or 87 octane. My melted down 1991 XR600 needs a new piston and bored out to the next size. I think it's 1.0mm or more over already so a re-sleeve may be in order anyway. Oh yeah, I'm on a budget for this bike and would like to have most of the rebuild parts ready when I box it up in Dec. In other news, I have a brand new Wiseco piston (0.076/0.0030 over) piston/pin/rings/clips that I don't need. Any takers? "O"