97 vn800a - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 25 (permalink) Old 05-15-2017, 01:21 PM Thread Starter
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97 vn800a

Hello all!! I am hoping anybody could give me some help. To start I have a 97 Kawasaki Vulcan 800a 11k miles.
She starts up and idles fine but given any gas she dies. Also if you put you hand on the air filter cap/top and push inward toward the carb she stalls out, while running the bike sputtered and back fires up through the carb. While driving the bike will have moments of sudden hesitation and when off throttle decelerating the bike backfires and pops. Please help. I havent had this bike long. The previous owner must have either dropped it or hit it with their car. Also runs super rich and sounds like it has a dead cylinder almost... When I give it hell on the throttle she doesnt let up and takes it. Shifts fine. After she warms up she drives better. But I have to get on the throttle pretty hard from a dead stop to get it to go. Like if I try to release the clutch slowly and go she dies instantly like no bogging just "poofff" and then takes a min to start back up.

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post #2 of 25 (permalink) Old 05-15-2017, 01:29 PM
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We cannot help You virtually Just start with Your carburetor cleaning and fine tuning. Then check Your valves. Two simple logical steps.
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post #3 of 25 (permalink) Old 05-15-2017, 01:29 PM
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Sounds like the carbs need cleaning. The needing to rev hard to move, sputtering, all things my wife's Shadow did before a carb cleaning. I had the carbs cleaned on my 05 back in 2010 when I got it, and with a little fuel stabilizer each fall for a couple of tanks, [knock on wood] I haven't had a carb problem since.

I also recommend shimming the jets when you do so. This will remove some of the Kawasaki cold-bloodedness. My 05 VN800B doesn't need the choke on at anything over 60 degrees out, and runs like a scalded dog.

Just my $.02

-John

2016 Vaquero (mostly stock)
2005 VN800B Bobber (Blue Collar Bobbers kits)
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post #4 of 25 (permalink) Old 05-15-2017, 02:50 PM Thread Starter
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But wait there's more

I know the fuel peacocks are vacuum actuated and weirdly designed. Mine has some blue rtv silicon squishing out of it and fuel dumps out no matter what... Also an issue?

Sputteringsputnik
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post #5 of 25 (permalink) Old 05-16-2017, 12:36 AM
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Yes and no. Originally the petcock should be controlled by a vacuum. If Your carb float needle is OK, nothing bad should happen even if Your petcock is always open. IMHO, if You have to repair it to work properly with a vacuum, better by a new one - an alternative from SUZUKI. There was a topic couple of pages ago.

Last edited by tehnis; 05-16-2017 at 12:39 AM.
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post #6 of 25 (permalink) Old 05-17-2017, 12:21 AM
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The carb is mounted to the intake with a rubber boot. Sounds like its bad or its not sealed good on the carb/intake, this will cause a vaccum leak.

2005 800 classic
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post #7 of 25 (permalink) Old 05-18-2017, 07:52 AM Thread Starter
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So I probably have a bunch of little issues then. I appreciate all the help

Quote:
Originally Posted by rick View Post
The carb is mounted to the intake with a rubber boot. Sounds like its bad or its not sealed good on the carb/intake, this will cause a vaccum leak.
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post #8 of 25 (permalink) Old 05-18-2017, 08:37 AM
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Actually, You can test a vacuum leak by using a starting fluid (aerosol). Just spray it over Your rubber intake when engine is running. If You've got a vacuum leak, Your rpm will increase.
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post #9 of 25 (permalink) Old 05-18-2017, 09:44 AM
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Quote:
Originally Posted by tehnis View Post
Actually, You can test a vacuum leak by using a starting fluid (aerosol). Just spray it over Your rubber intake when engine is running. If You've got a vacuum leak, Your rpm will increase.
Even better, spritz bottle filled with soapy water. Spray suspect area and watch for bubbles to get sucked in.
Not flammable, just in case you have a spark leak somewhere.
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post #10 of 25 (permalink) Old 05-18-2017, 12:32 PM
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That bike has been idle for most of its life. The right way would be to pull the carb and rebuild it. I would imagine the fuel inside turned to varnish a long time ago. If you would rather not then you need to clean outside components and run heavy duty carb cleaner through the fuel tank. Sometimes it will work. If it is too bad your only choice may be to rebuild it.

Last edited by RetroBagger; 05-18-2017 at 12:37 PM.
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