Join Date: Nov 2007
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I have a Bazzaz, but same issue.
Most responders said to get it on a dyno, when I asked the same question. I've been trying to read up on the subject, but most books on electronic engine management cover car engines. In the books one author said that max torque can be made anywhere between 11.5 and 14.5, which isn't much help. Another narrowed it down more to between 12.8 and 13.4. So I think the advise given on this forum is the only way to go, because there is no set number that works the best, although I think 13.0-13.2 is in the ballpark.
My plan is to bring it to the dyno during winter and make some runs starting at 12.8 and going up towards 13.4. I may extend in both directions if power is still increasing, and it's deemed safe to run any leaner. When I overlay the graphs of the different A/Fs I will see which A/F ratio makes the most power across the whole rev band. Then I will start making changes to the ignition timing, trying to squeeze the last couple of horses out of it. I think this will be a good way of doing this, but I will of course listen to the dyno operator, who has more experience in these matters.
Once I have the best A/F, which may be different at low, mid and high revs, I can use the Bazzaz to keep the bike at optimum tune.