air/fuel adjustment - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 9 (permalink) Old 10-26-2013, 05:46 PM Thread Starter
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air/fuel adjustment

I have read several posts on the air/fuel adjustments for the carbs, my manual says 1 5/8 out, many have said 2 1/2 turns out is best....I assume these adjust the rich/lean of the carb? Reason I ask is Im at 5,000 elevation, would 2 1/2 turns be too rich, thats what I have mine at now but I notice the plugs are dark.....and the bike I assume has stock jetting. thanks.
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post #2 of 9 (permalink) Old 10-26-2013, 07:44 PM
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2 1/2 turns out is base line for tuning a carb, from there you are fine to go one more full turn in or out.

Last edited by slimvulcanrider; 10-28-2013 at 12:17 PM.
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post #3 of 9 (permalink) Old 10-26-2013, 10:17 PM
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Hey slim exactly how do you tune a crab? Lol

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post #4 of 9 (permalink) Old 10-27-2013, 12:25 AM
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I've heard you can tune a piano AND you can tuna fish, but a crab??

Sorry, couldn't resist...



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post #5 of 9 (permalink) Old 10-27-2013, 12:45 PM
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These screws only alter the mixture at slow running, unless of course, you have very exotic crabs!

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post #6 of 9 (permalink) Old 10-27-2013, 01:15 PM
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Make sure no fuel is passing through the vacuum line off the petcock to the left carb.

Make sure the 'choke' plungers are closing all the way.

Coasting Enrichers could be stuck open.

Air filters are clean?

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Hey slim exactly how do you tune a crab? Lol
Crab? usually about a 1/4 turn, pull, dip in butter ... yum. Wipe the chin.

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post #7 of 9 (permalink) Old 10-28-2013, 12:06 PM
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The pilot air screws are active from 1-3 1/2 turns. Factory is 1 5/8 turns and most would consider it too lean.

This adjustment is mostly to adjust 'manners'. Pulling away from a stop, etc. You could run this adjustment too lean with out damage.

I adjust mine to where the bike will chug happily at idle in second gear at idle on level smooth pavement. If it can do that, you will not improve the neutral idle. I like mine to have excellent 'manners'. IE, a little too rich.

HTH.
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post #8 of 9 (permalink) Old 10-28-2013, 12:20 PM
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Quote:
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Hey slim exactly how do you tune a crab? Lol
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I've heard you can tune a piano AND you can tuna fish, but a crab??

Sorry, couldn't resist...

You guys got me...
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post #9 of 9 (permalink) Old 11-06-2013, 02:29 PM
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Mine are at 2 1/2 turns out, at 1200 feet. It gets a bit rich at 9,000 feet when I ride up in the mountains, and will sometimes die at idle. It has a perfect 1000 rpm idle at 1200 feet with no misfiring. The tach needle looks dead still.

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