87 89 0r higher - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 20 (permalink) Old 08-09-2008, 03:45 PM Thread Starter
 
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87 89 0r higher

Heard a mech tell someone to use 87 octane in his crotch rocket the other day.He told the guy it burns faster.What octane has been working for you guys?Thanks
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post #2 of 20 (permalink) Old 08-09-2008, 05:37 PM
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Regular ol' 87 here, and I think alot of the group does as well, though I'm sure they'll say so. Works just fine in our bikes.

As far as the impending war over which octane is better-I'll leave that for others and keep on doin' it like I've been doin'.
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post #3 of 20 (permalink) Old 08-10-2008, 12:11 AM
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The bike is designed to run on 87 octane fuel. Octane rating is a vastly misunderstood topic. Higher octane does NOT equal better performance. Octane simply measures a fuels resistance to preignition (knocking). The higher the octane, the better its preignition resistance. Higher octane fuel actually burns cooler because of this. The only reason to run the higher octane fuel is if you have a high, 12:1 or better, compression ratio. Our bikes are at about 10:1 so 87 works just fine.
The higher octane fuels also contain a lot of detergents to clean the intake and exhaust systems. If you run a higher octane than recommended, the lower burning temperature of the gas creates residue in the exhaust system that the detergents can't get rid of because the fuel isn't being burned efficiently. It can lead to a gunked up exhaust system though your intake will be squeaky clean. Stick with 87.

Some of the confusion comes from the owners manual where it says to use either 91 or 87. This is because different countries use different methods to arrive at octane ratings. We use R+M/2. This is where the 87 comes from. Other places only use the R value and this is the 91. In the US we use the R+M/2 so again, stick with 87.

Jim W
93 VN 750 "Ursula"
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post #4 of 20 (permalink) Old 08-11-2008, 02:53 PM
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I've had no problems with 87 over 10,000 miles.
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post #5 of 20 (permalink) Old 08-11-2008, 05:48 PM
 
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Interesting.. I read somewhere on the bike (can't remember exactly, maybe in the toolbox thing behind the seat) it said to use 91 octane. Before that I've been running regular, but since I read that (a few weeks ago) I switched to premium..

If there's no difference (or if 87 is actually better), I guess I'll switch back to regular...
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post #6 of 20 (permalink) Old 08-11-2008, 08:45 PM
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Quote:
Originally Posted by uffs View Post
Interesting.. I read somewhere on the bike (can't remember exactly, maybe in the toolbox thing behind the seat) it said to use 91 octane.

If there's no difference (or if 87 is actually better), I guess I'll switch back to regular...
Quote:
Originally Posted by Sky Rider View Post
Some of the confusion comes from the owners manual where it says to use either 91 or 87. This is because different countries use different methods to arrive at octane ratings. We use R+M/2. This is where the 87 comes from. Other places only use the R value and this is the 91. In the US we use the R+M/2 so again, stick with 87.

The "WE" Sky refers to is the USA.
So Uffs, stick with the lower (but still overly...) priced fuel!!


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post #7 of 20 (permalink) Old 06-27-2010, 12:38 PM
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Old post, but things are seemingly dead on the forum so seems like a jump start is in order soooooooooo...
http://www.motorcycleanchor.com/moto...mc_octane.html
Have a good one...Old Dog...

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post #8 of 20 (permalink) Old 06-27-2010, 09:39 PM
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Good article Old Dog. I saw a few paragraphs in Popular Mechanics a couple of years ago that explained the RON and MON numbers, but this goes into more detail.

Gordon

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post #9 of 20 (permalink) Old 06-28-2010, 01:34 PM
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I've tried premium gas and the 87 octane. 87 octane gas gave me a LOT better MPG. Premium gave me about 90 miles per tank, 87 octane gives be about 120 miles per tank. Lately, i've been filling up at "no ethanol" gas station and that gas has been making my bike running a lot nicer. Stated using it for my truck too and it actually made my engine run really quiet. Also, I use a dose of Seafoam once a month as maintenance.


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post #10 of 20 (permalink) Old 06-28-2010, 03:53 PM
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Quote:
Originally Posted by Chavisimo View Post
Lately, i've been filling up at "no ethanol" gas station and that gas has been making my bike running a lot nicer. Stated using it for my truck too and it actually made my engine run really quiet.
My son has a Gen. Store that is close to a lake and he sells gas to a lot of boaters and his gas is non-ethanol which is what I have always run except when caught out somewhere and its not handy...
I did run 93 Oct. in the VN750 and still do in the Sporty, I just like it from the older high HP outboards I guess, it does have more cleaners and basically eliminates the need for other addatives in my opinion, and also in eyes of OMC, Mercury, & Chrysler OB Mfgs. or did in the 70s anyway...
Have a good one...Old Dog...

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MicroTach +, Higher wider H-bars, GPS Mt., Mustach bar Hwy. pegs...
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