Gasoline Octane preference - 2017+ Kawasaki Z650 Forum
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post #1 of 18 (permalink) Old 08-16-2019, 04:27 AM Thread Starter
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Just wondering what grade of gasoline you all use. I've used nothing but 87 octane {regular} and 13000 miles no problems. Anyone have any thoughts? I have buddies that swear by higher Octane.

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post #2 of 18 (permalink) Old 08-16-2019, 08:39 AM
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87 is what Kawasaki specifies, and 87 is what I use. Folks who insist on using higher-octane gas are not only wasting money but possibly degrading engine performance and mileage.
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post #3 of 18 (permalink) Old 08-16-2019, 11:52 AM
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i sometimes use 89.. there's a difference in performance..i like it
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post #4 of 18 (permalink) Old 08-16-2019, 08:53 PM Thread Starter
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I will try a higher Octane next two tank full just to test out.

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post #5 of 18 (permalink) Old 08-19-2019, 03:24 PM
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I've been using 98 lately and my bike feels sharper. I'm not sure but I don't think we have anything lower than 95.
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post #6 of 18 (permalink) Old 08-19-2019, 04:01 PM
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Quote:
Originally Posted by amire View Post
I've been using 98 lately and my bike feels sharper. I'm not sure but I don't think we have anything lower than 95.

There are three different methods of rating octane. The method used in the US begins at 87 and goes to 94 for automotive gasoline -- in very high-altitude locations you might see 85. These numbers are 4 to 6 points lower than the same fuels rated under the systems used in most of the rest of the world.
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post #7 of 18 (permalink) Old 08-19-2019, 04:27 PM
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Bought my z650 brand new and I used 87octane for the first 1000km.
Then for a while the bike felt strange. It had a weird response and made a couple of pings when I eventually stalled the bike. Heard the ping three other times as the bike stalled.
I figured it was engine knock, probably from a wierd spout of the engine break-in process creating some hot spots of friction.
So I switched over to 91 octane and it was night and day. Bike felt peppier, got much better mileage than the the previous tanks fillups and never again has that sound reappeared.

Now my bike has close to 5000km and I just switched back to regular octane. One tank through and I felt little to no difference. Gonna keep at it for a while and see if something changes, but I have a feeling that what ever issue I had during the break in has worked itself through.
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post #8 of 18 (permalink) Old 08-21-2019, 06:31 PM
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Quote:
Originally Posted by oldenslow View Post
There are three different methods of rating octane. The method used in the US begins at 87 and goes to 94 for automotive gasoline -- in very high-altitude locations you might see 85. These numbers are 4 to 6 points lower than the same fuels rated under the systems used in most of the rest of the world.
Hmmm, I'm using 95 - might switch to 98. Get the odd backfire and lurch with current fuel.....
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post #9 of 18 (permalink) Old 08-21-2019, 06:50 PM
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I am actually trying to run out this tank so I can return to 87. I've been using 93, and had a number of backfires (as well as stalling issues) which might be related.

2019 Ninja 650
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post #10 of 18 (permalink) Old 08-21-2019, 09:33 PM Thread Starter
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I am actually trying to run out this tank so I can return to 87. I've been using 93, and had a number of backfires (as well as stalling issues) which might be related.
Darn, and this is all with the stock exhaust?

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Last edited by czrlaker; 08-22-2019 at 02:32 AM.
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