Thanks for the info everyone. Actually, I'll be racing in Nova Scotia. The bike will come back to Maine at some point but not this year. I will check out the other thread.
One of the reasons I'm asking is that the bike was originally prepped for a race series by Kawasaki Canada and I strongly suspect they set it up on 91 (it has a PCV). I don't know why the higher octane was used: as mentioned, there's no advantage in doing so, but if they did I'm afraid to run 87. Timing is advanced 2* at larger throttle openings 6500 to redline. I don't know if that's enough to get into detonation with quicker burning fuel. Unless I can find out for sure how it was set up I'll probably run 89.
What it really needs is to inhibit the air injection stuff and autotune.
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