What Octane to use? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 26 (permalink) Old 06-26-2006, 03:53 AM Thread Starter
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Question What Octane to use?

Have been trying to find out the best fuel octane to use, but
there is no real consenses. Have heard from some that say
87 is OK, the Vulcan godess says to use 89, and the decal
on the bike says not less than 91..

Am wondering what the Haynes, Kawasaki Shop, and Clymer
Service Manual say about Octane rating?
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post #2 of 26 (permalink) Old 06-26-2006, 12:32 PM
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I have used 87 to 110 and have not noticed any difference in teh way the bike runs. Stay with the cheep stuff.

Chad Falstad "Hawk"
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post #3 of 26 (permalink) Old 06-26-2006, 12:42 PM Thread Starter
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Question Still confused..

My dealer in Coeur D' Alene, Idaho said that the bike had only been
on the showroom floor for 2 days, but when I started driving it I
noticed that it ran rough at low speeds, so I drained out whatever
the dealer put in the tank and put in 92 Octane and it smoothed
out significantly.

I'm sure 87 octane would be great for Freeway speeds, but around
town I'm not so sure.
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post #4 of 26 (permalink) Old 06-27-2006, 02:56 AM
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My feelings are to use what works best for your riding style and location. Everyone and every place is different.
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post #5 of 26 (permalink) Old 06-27-2006, 05:04 AM
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I thought I saw in the owners manual that 87 is what's recommeded.

I usually run the higher grade, just cause they say it's supposed to be better. (But I still haven't figured out who They are ?!)
I have run 87 more than a few times, and can also say I couldn't notice much difference.

Run a few tank fulls of each, and see how you feel about it.

Here's one way to see if there's a difference ............

Try to pay attention while going up a particular hill you travel, with the bike in 5th gear, and keep it steady at whatever RPM's you feel comfortable with.(but not really flyin'... just a bit above "chuggin'" it) Then try the other grade the same way, same RPM's, driving conditions, (and preferably same temperature)
Try doing it when each tankfull is down to about Ĺ.

I would think if one works better for your bike than the other, this way might tell.

Just a though, as I'm not a trained fuel systems analyst, and I have no written documentaion to back up this hypothesis.
Which means, if it comes down to it, I will deny everything !!

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Last edited by hyperbuzzin; 06-28-2006 at 05:41 AM.
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post #6 of 26 (permalink) Old 07-12-2006, 10:06 AM
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Exclamation

Quote:
Originally Posted by Ccspinner
I have used 87 to 110 and have not noticed any difference in teh way the bike runs. Stay with the cheep stuff.

yea stay with the sheap stuff...5 years ago it didn't matter what stuff you got but now it is like $3 a gallon...i use 87 octain...

'86 Vulcan 750.
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post #7 of 26 (permalink) Old 07-12-2006, 12:08 PM
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All other arguments aside, there is one that tells me the bike is running best...I get 5 mpg more using 89 octane.
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post #8 of 26 (permalink) Old 07-12-2006, 03:51 PM
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I started with the 92% octane to have the best gas, and sometimes it would run terrible. My son said that these bikes were actually intended to use 87% , but the 89% would be the equivalent of the 87% from 7-9 years ago. He was right! Better gas mileage and runs like a scalded dog. Just my humble 2 cents!
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post #9 of 26 (permalink) Old 07-12-2006, 07:58 PM
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Howdy folks just a little info for you on the octane thing . I use 93 in my 750 In reality all fuel (gas) it all burns at the same rate. The difference is the higher the octane the more anti knock compounds that are put in . Soif your bike or car is knocking you would a higher octane rated gas yes. And being that my bike has 10.3 to 1 compression . I will go with higher octane KRAWDAD7.
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post #10 of 26 (permalink) Old 07-12-2006, 08:08 PM
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i use 89 octane and get between 66 to 58 miles per gallon & the bike runs good. the previous owner used 93 octane and said he had no popping. i get the popping, but because the group said 87 is all you need, i compromised. but the next tankful , i am going to give 93 a try and see for myself.
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