BusyWeb
Junior Member
Sorry, Nuke..it
Double post, how to delete post???
Double post, how to delete post???
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That's what I thought too for throttle response time... ha ha haI think i do agree with you about the slight delay in throttle response with the higher octane. I thought i was imagining things and thought it must be in my head, sooo I'm glad to hear I'm not completely crazy!!
It could be possible that given the state of tune of your bike that one octane will work better than another. I would think this is most possible on a 2004-2006 given the open-loop nature of the FI system (AFR affects burn rate as well as timing and octane).
Additionally if the TPS is a bit off or something you might not get the true factory timing value, maybe a bit more or a bit less advance...in which case the octane may become a bigger factor.
Personally I'm staying with 87. :thumbup:
What year fz6 are we looking at? I just took a glance at my '09 user manual and yamaha recommends nothing less than 91. However I believe when I bought my bike it just had 87 in it (dealer filled up the tank upon my purchase to get home) and I wouldn't imaging they put expensive 91 in for me but the bike ran fine. I feel like going back down to 87 for fuel economy reasons but I am a little hesitant to do so. ???
What year fz6 are we looking at? I just took a glance at my '09 user manual and yamaha recommends nothing less than 91.
I feel like going back down to 87 for fuel economy reasons but I am a little hesitant to do so. ???
I have an odd question. I have been trying to answer this question for a while with the use of the internet with little success.
Truth.. Octane is a combustion suppressor. It prevents pre-detonation in high compression engines. If you haven't changed the internals, you haven't increased compression. Yamaha recommends Regular, I use regular. There is actually more 'power' avaliable in lower octane fuels.Due to the squish design and compression ratio, I think you're fine running regular.
Personally, wouldn't run any of our bikes on anything less than 98, but I'm in Australia and I don't know what your highest octane level is.
The extra money is well worth it. Looks after the engine a lot better.
Pretty quick, I actualy looked at it again and it states exactly as you said so in the end 87 will do just fine. I'll keep this in mind next time I am at the pump. Thanks!How quick was that glance? My 2007 manual states the following on page 3-11 regarding octane requirements:
"Your Yamaha engine has been designed to use regular unleaded gasoline with a pump octane number [(R+M)/2] of 86 or higher, or a research octane number of 91 or higher."
The 91 octane requirement is based on it being a research octane number (RON). Did you see that number and interpret it as the pump octane number, or is 91 specified as the minmum (R+M)/2 octane in your manual?
If you mis-read your manual, my vote (which I follow every time I fill up my tank) would be to go down to 87.
i only run 110 octane race fuel...i get 75 mpg and make an extra 25 hp as a result. Oh yeah, the race fuel weighs less so my wet weight is down about 15 pounds too. I figure the small extra cost is worth it.
What year fz6 are we looking at? I just took a glance at my '09 user manual and yamaha recommends nothing less than 91. However I believe when I bought my bike it just had 87 in it (dealer filled up the tank upon my purchase to get home) and I wouldn't imaging they put expensive 91 in for me but the bike ran fine. I feel like going back down to 87 for fuel economy reasons but I am a little hesitant to do so. ???
All high performace vehicles should run the highest level of GAS pump octane, and according to yamaha our bikes need the highest available, it's not like in cars, for example a little 4 cyl eclipse that runs on unleaded gas MUST run on 87, it CAN run on 93 but it's not made for it, it wont work out well, on bikes, they are high preformace, and made to revv and love gas, so go with the highest possible AT A PUMP LEVEL!!!!! why do you keep wanting to put in 87, is that like the highest you have there?