03' Vulcan 750... No Idle without choke. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 5 (permalink) Old 02-24-2014, 09:39 AM Thread Starter
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Exclamation 03' Vulcan 750... No Idle without choke.

I bought a 2003 Vulcan 750. The bike had set for an unknown amount of time with gas in it. (the guy said 24 months.. but the tags expired in 2009)

I got the bike home shot some brake cleaner up in the carbs and it started right up.

I took and emptied the gas tank. put half a bottle of Seafoam and about 1 gallon of gas in it and dumped some seafom into the carbs. From this point on the Bikle starts right up. I ran it through all the gears while on the stand and took it around the block.

Issue seems to be that it wont idle without the choke.

I took out the Needle Jets and sprayed some B12 Chemtool up in it and also cleaned those jets with it while out. I replaced them and had them set at 2 1/2 turns out from bottoming. Then I reset them to about 1 turn out due to burning rich.

I also had let some B12 Chemtool sit in the carbs for a few hours to get rid of any varnish that may have been inside.

Any ideas to get it to idle without the choke?
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post #2 of 5 (permalink) Old 02-24-2014, 09:51 AM
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Try the idle jets

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post #3 of 5 (permalink) Old 02-24-2014, 09:54 AM
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Did you adjust the idler on the carb, the black knob on the left? Could also be a cracked carb boot from carb to engine leaking air since the bike been sitting some.

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post #4 of 5 (permalink) Old 02-24-2014, 10:57 AM
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Originally Posted by Christy061990 View Post

Issue seems to be that it wont idle without the choke.

Then I reset them to about 1 turn out due to burning rich.

One of these statements is wrong.
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post #5 of 5 (permalink) Old 02-24-2014, 02:45 PM
Crap, I WAS in 5th gear.
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OlDirtyDoc is right- the problem is with your idle circuit. The idle jets are nearly impossible to get out without removing the carbs.

Check your float level first. Remove the idle screws and spray carb cleaner in there. Drain the float chambers and spray carb cleaner into the vent lines. Blow compressed air up through the float drain. Spray carb cleaner through the small holes at the throttle plate.

If this doesn't work, you'll need to remove the carbs for mechanical cleaning. 2 years is a heck of a long time for fuel to sit in the carburetors. As long as you have everything apart, upsize the idle jets one size if you are near sea-level.

Last edited by Kelly2001; 02-24-2014 at 02:48 PM.
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carbs , choke , gas , idle , throttle

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