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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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Discussion Starter #3
Yes altitude and carburetors can be tricky.
 

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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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Chasin' the blacktop
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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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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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Linkmeister Supreme
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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.....
Yup, Wolfie is right. Stock vn700/750 is 10.3:1. :rockon:
 

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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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