What octane fuel you using?

[SUPERCRUZ_imp]

Running 91 Octane in my CB. Here is my theory. I am not looking for extra power but guarding against pre-detonation on hot days. Lower octane fuel burns quicker and is more pre disposed to pre-detonation in high compression engines. While the CB1100 does not have all that high a compression ratio, it is air cooled and thus in my opinion subject to higher than normal head temperatures. It would seem logical to me that running higher octane fuel such as 91 will combat any chances for pre detonation of the fuel on an air cooled engine such as the CB. For those running 87 in their CBs, this is what the manual calls for and thus I am sure it is just fine. I choose to run the 91 for peace of mind and have not had any issues thus far. On a side note, I also run a half ounce of StarTron fuel enzyme in each tank of gas. This stabilizes the fuel and helps with keeping the injectors clean and removal of water build up in the tank.