Question about 1988 Yamaha FZ 600

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Octane Well I have been doing some research, not always a good thing, and I think I may have stumbled upon something. I recently did an ignition upgrade( on my FZ 600 this has helped with fouling sparks plugs. After the uprgade I went to stock jets 60 and 115. The engine just wouldn't pull past 7,000 rpms. This bike is supposed to have peak power 36hp@10,000rpms. So i changed the jets to 60 and 105s and has definetely been running stronger. However I still don't believe i should be that far off on carb settings. I have been using 93 octane gasoline. I then read something interesting, that low octane gas burns faster and leaves fewer deposits, and that low octane is good for low compression engines, my bike 9.5:1 not sure how high that rate is? What do you think about the idea?

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I don't know if the octane makes that much of a difference. I don't know if it's because I'm cheap or what but I've always ran 87 octane in my 350 and they seem to like it. They also pull all the way to 10K with no problems. The ignition upgrade you did was that the one running power from the key source to the coils? Just remember not to leave your key on to long with out the bike running. Constant power to the coils is known for burning them up. Done this a few times on cars. Good Luck!!!

Posted on Nov 10, 2008


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