Claviger
Aspiring Student
- Joined
- Jul 25, 2014
- Messages
- 6,934
- Location
- Olympia Washington
- Ride
- '21 Z H2, '14 R3R, '02 Daytona 955i
Remember, octane can effect speed of the flame front as well as knock resistance. This why you are not actually harming a motor if you use too high an octane, but can certainly Damage one with too low an octane.
There is a lot more than just octane that determines burn speed, sedatives, specific gravity etc. What he said about excess fuel in the cat and on the o2 sensor are valid points, but there's much more than just octane as the predictor.
The best bet is run the gas your ignition timing was set to, be it stock or modified, stick with what it was tuned for. Running 87/89/91/93 will be a very slight change in power if your bike isn't tuned to it, and your not doing the motor any favors running premium through it, quite literally burning money needlessly running 91+ on a stock timing bike.
Anecdotally, there is a large number of people who had a worse running bike using premium vs mid grade, which was resolved going back to mid grade in the Daytona 955i community. Probably a result of "right on the money" ignition timing when paired with 89 on those motors.
Its a bit like oil though, people will run what their grey matter tells them they feel like running, and honestly its not a huge deal.
There is a lot more than just octane that determines burn speed, sedatives, specific gravity etc. What he said about excess fuel in the cat and on the o2 sensor are valid points, but there's much more than just octane as the predictor.
The best bet is run the gas your ignition timing was set to, be it stock or modified, stick with what it was tuned for. Running 87/89/91/93 will be a very slight change in power if your bike isn't tuned to it, and your not doing the motor any favors running premium through it, quite literally burning money needlessly running 91+ on a stock timing bike.
Anecdotally, there is a large number of people who had a worse running bike using premium vs mid grade, which was resolved going back to mid grade in the Daytona 955i community. Probably a result of "right on the money" ignition timing when paired with 89 on those motors.
Its a bit like oil though, people will run what their grey matter tells them they feel like running, and honestly its not a huge deal.
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