- Joined
- Jan 31, 2010
- Messages
- 3,106

I just finished new rings/hone new valves and seals on my 850. The valves lapped in and no leakage at all (several teaspons of WD 40 would not seep past any of the valves, even when left for several minutes). Put it together today, torqued everything down. Tomorrow I'll mount the tank and fire 'er up. Interestingly, I did a compression check. Before the rebuild, compression when cold, throttle wide open, was 134/138. After the rebuild it was 120/120 BUT even though the compression showed lower, it was noticeably harder to kick over. Wonder what's up with that? There was a lot of carbon in the combustion chambers/piston top that is not there now which might explain the lower compression even if it is sealing better. Though I guess it might also be related to the fact that I can't kick it through as quickly which might affect the static compression. Yes, no?