The snow is coming, time for a high compression rebuild!
Hey guys, the time has finally come. After years of riding the 929 the way I bought it, I'm going to dive into a bottom end rebuild. I am planning on boring it out to a 954 or a 980 and go high compression. I have read a few articles on here about how going to 980 makes the cylinder walls too thin, but I am going to do some more research on that before I make my final decision, but your input would be appreciated. The reason I am making this post though is I am having a hell of a time trying to figure out how high I can go on the compression ratio and still run on 93 octane gas? I would prefer to go over 13:1 if I can, 13.5:1 would even be better. Does anyone know what how high you can go and still run 93? I don't want to sacrifice timing or anything that complicated. I plan to install more aggressive cams in the near future as well to maximize the gains from the higher compression and maybe some port and polish work. My second question is, while I have everything apart on the bottom end what are some other components I should replace while I am in there? My bike has 36000 miles on it now, I purchased it with 18000 and I can tell from my time on this forum that from the way it feels, it was probably abused pretty heavily by the previous owners. I miss shifts in to second gear more frequently than I would like to, and rarely it will pop out of gear as well as hit a false neutral in shifts from 4th to 5th. I definitely plan on inspecting the shift forks, shift drum and clutch materials while im in there, just wanna know if there is anything else I should pay close attention to.