Will only run on choke - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 01-29-2012, 03:21 PM Thread Starter
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Will only run on choke

just tried starting the bike for the first time in 10 weeks and it will only run on choke. it tries to start but i can only get it started on choke and then it will die like it should if left on choke and if i let the choke off even a hair it will die.
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post #2 of 8 (permalink) Old 01-29-2012, 04:51 PM
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I'd drain the carbs, fill them with Sea Foam, and let sit 24-48 hours. If you're in a hurry, remove the drain screws and insert a straw on a can of carb spray and let 'er rip.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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post #3 of 8 (permalink) Old 01-30-2012, 01:55 PM
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10 weeks with gas in the carbs? No wonder it won't run. The jets are plugged up. The reason it will run on choke is that the Vulcan 750 doesn't actually have a choke, it has an enrichening circuit, which bypasses both the main and pilot jets. When you turn the "choke" off, it no longer gets gas. I agree with draining the carbs and filling them with Seafoam and letting them soak. Try to start it with the carbs full of nothing but Seafoam. It will fire, but probably won't run. The idea is to actually suck Seafoam into the jets. I don't recommend any kind of automotive carb cleaner, it is keytone based, and will damage the rubber and plastic parts in the carb. If the Seafoam doesn't work the first time, try it a couple more times before pulling the carbs to clean them.

I strongly recommend that if a bike is going to sit that long, that you drain the carbs, fill them with WD-40, then drain that. It wil protect the inside of the empty carbs from corrosion. And yes, I know a lot of the time people do not PLAN on it sitting that long, myself included. I have done the same thing you did, and I paid the price. Now I try to watch it.

I am a motorcyclist, NOT a biker.


1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike
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post #4 of 8 (permalink) Old 01-30-2012, 07:46 PM
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Jerry, my bike sat for the best part of a year after my accident with a half full fuel tank and gas in the carbs. It started without any problems the next summer. And that was before I knew anything about Seafoam.

It has sat through the winters of 2009 and 2010 with Seafoamed gas and started well the next summers too. For example after the winter storage last spring I cranked it over for about 15 seconds, then let the starter cool for 30 seconds, then cranked again for 10 seconds when it caught and ran.

I did run the carbs dry this fall before leaving it sit for another winter. I expect it will start right up after a few seconds cranking again.

Your Arizona temps are hotter than ours, so the fuel may evaporate quicker than mine does.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html
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post #5 of 8 (permalink) Old 01-31-2012, 09:40 AM
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The same here,as OlHoss said !. I been leaving mine with fuel in tank and never drained the carbs in the 9 years iv'e had it !. It stands outside under a canvas sheet throughout the 4-5 months of the hard british winters. All i do is charge the battery,crank it a few times (like OlHoss) and vroooom,off it goes !!. Ps,,hope im not pushing my luck posting this on here !,,cos its going to be another 2 months before it gets started for the roads here in the uk,,far too much ice about yet. ROLL ON THE SUMMER

AGEING IS INEVITABLE,,MATURING IS OPTIONAL

VN 750 A8 1992.
27000 miles.
Imported from California
to UK in 1996.




New for 2012.
new filters(foam type)
replacement shocks(MDI)
Iridium plugs.
AGM battery(platinum)
brake pads(Kyoto)
(All on and running)
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post #6 of 8 (permalink) Old 01-31-2012, 07:25 PM
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Quote:
Originally Posted by OlHossCanada View Post

I did run the carbs dry this fall before leaving it sit for another winter. I expect it will start right up after a few seconds cranking again.
So how do I run the carbs dry? Turn off the fuel while it is running?
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post #7 of 8 (permalink) Old 01-31-2012, 09:28 PM
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Quote:
Originally Posted by psvines View Post
So how do I run the carbs dry? Turn off the fuel while it is running?
You got it. Just turn the petcock/fuel valve off while the engine is running and let it go til it quits.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/showthread.php?t=9127
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post #8 of 8 (permalink) Old 02-01-2012, 06:03 AM
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You may be able to get a little more out by utilizing the carb drain screws.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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