85 Octane - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 06-21-2014, 02:45 PM Thread Starter
KAT
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85 Octane

I have read a lot about what type of fuel to use in my 93 Vulcan, most people say that the standard 87 octane fuel is just fine, here in Colorado the standard fuel is 85 octane, is that to low of octane?
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post #2 of 8 (permalink) Old 06-21-2014, 03:20 PM
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Should be fine. If you feel knocking (sound of marbles shaking in a can) you might need to go up to mid grade.

Am more concerned about your altitude there....

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post #3 of 8 (permalink) Old 06-21-2014, 05:19 PM Thread Starter
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Yes altitude and carburetors can be tricky.
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post #4 of 8 (permalink) Old 06-21-2014, 10:16 PM
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I run midrange Sunoco...I think its 89 or 90....(mine is modded though)...
Shame we dont have the old style magnetos...you could advance or retard the spark to suit....progress is not always better, lol...



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post #5 of 8 (permalink) Old 06-21-2014, 11:43 PM
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With 9/1 compression like we have (engine in like new condition) I'd prefer 87 octane. You don't want any higher octane than your engine requires but 85 octane is works better in engines lower than 8.5/1 compression like cars in the 70's had.

Try the 85 octane but if you feel the slightest "knocking", especially at idol, go up one grade.

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post #6 of 8 (permalink) Old 06-22-2014, 10:12 PM
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9:1 ???...mine is 10.3 : 1 stock and since mine has only 5k orig miles...mebbe 10:1.....that warrants higher than regular, IMO....

In the 70s....any hot rod runnin 9.5:1 pistons and up, all ran Sunoco 260, which was 98 I believe.....



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post #7 of 8 (permalink) Old 06-23-2014, 05:11 PM
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Quote:
Originally Posted by Wolfie View Post
9:1 ???...mine is 10.3 : 1 stock and since mine has only 5k orig miles...mebbe 10:1.....that warrants higher than regular, IMO....

In the 70s....any hot rod runnin 9.5:1 pistons and up, all ran Sunoco 260, which was 98 I believe.....
Yup, Wolfie is right. Stock vn700/750 is 10.3:1.

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post #8 of 8 (permalink) Old 06-24-2014, 09:33 PM
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Thank you brother Gordon....good to see ya again....was about ta give ya another ring.....

IMO....anything over like 9.75:1 needs at least a midrange.....



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