Gasoline Octane preference - Page 2 - 2017+ Kawasaki Z650 Forum
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post #11 of 18 (permalink) Old 08-22-2019, 03:08 PM
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2019 Ninja 650
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post #12 of 18 (permalink) Old 08-22-2019, 05:58 PM
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I certainly can't say high octane will hurt the engine, but I will say this: If I am running 87 with no problems, then switch to 93 or 94 and start having problems, the fuel sure has to be considered as a possible cause. Plenty of folks know more than me, but with things like vehicles, guns, and other complex potentially hurtful and expensive toys and tools-- I go by the manuals. It's hard to get bad results that way.
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post #13 of 18 (permalink) Old 08-23-2019, 08:26 PM Thread Starter
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Originally Posted by oldenslow View Post
I certainly can't say high octane will hurt the engine, but I will say this: If I am running 87 with no problems, then switch to 93 or 94 and start having problems, the fuel sure has to be considered as a possible cause. Plenty of folks know more than me, but with things like vehicles, guns, and other complex potentially hurtful and expensive toys and tools-- I go by the manuals. It's hard to get bad results that way.
With the recent posts about backfiring, I might stick with regular. I'm like you, if the manual says to use a certain thing, I stick to it, I am sure the engineers have a better idea about their design. However getting something better quality "should" not cause problems. For instance I've been using synthetic oil in all my vehicles since forever. Never had a problem and lasts longer. So I understand there could be performance gain.

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post #14 of 18 (permalink) Old 09-05-2019, 04:05 PM
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you're wasting your money higher than 87..unless you're not stock and have radically modified.. there is a thread somewhere here by Tremonte it was early on in this group.. smart guy.. does a lot of thorough testing
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post #15 of 18 (permalink) Old 09-08-2019, 07:58 PM
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I made this video quite a while back... Here's an explaination of octane types and the effects on different motorcycle engines.


Bored? Looking for info? Check here: www.tremonte.tv
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post #16 of 18 (permalink) Old 09-08-2019, 11:52 PM
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Just for curiosity's sake, over the past couple of weeks I ran 2 tanks of 89 octane through my Z650, then 2 tanks of 87. I really couldn't tell any significant difference in the power delivery between the two, but gas mileage was a different story. With the 89 octane, I averaged a fraction over 55 MPG. Using the 87, the mileage was a fraction over 58 MPG. Important to note, the trips made were identical over those two weeks other than maybe a couple of around-town jaunts -- overall, a mixture of in-town and highway trips that I take on a weekly basis -- and being conscious of the fact I was trying to make a valid comparison I took care to keep my riding style consistent over the entire period. Doesn't prove anything, of course, but it surely tends to support the manual's specification of 87 octane fuel.
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post #17 of 18 (permalink) Old 09-09-2019, 10:13 AM
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However getting something better quality "should" not cause problems.

But you are assuming that higher-octane is better-quality fuel. It's not. It's just formulated to work better in engines of higher compression ratios. Using high octane in an engine designed to run best on fuel of a lower octane rating is sort of like feeding your dog prime steak -- he might not object to it, but it's not necessarily the best thing for him!
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post #18 of 18 (permalink) Old 09-09-2019, 12:42 PM Thread Starter
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Originally Posted by oldenslow View Post
But you are assuming that higher-octane is better-quality fuel. It's not. It's just formulated to work better in engines of higher compression ratios. Using high octane in an engine designed to run best on fuel of a lower octane rating is sort of like feeding your dog prime steak -- he might not object to it, but it's not necessarily the best thing for him!
Good point, noted

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