Chronically Flooded Engine - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 10 (permalink) Old 09-25-2011, 05:23 PM Thread Starter
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Chronically Flooded Engine

Hi all,

So here's the current situation on my slow-to-restore Vulcan.

She starts up fine on the first go but once I kill the engine, it's flooded, but only on the front cylinder. The plugs are wet with gasoline and black from previous carbon fouling. When I let the engine and plugs dry out, she'll start back up again no problem.

The carbs have just been given an overhaul by a mechanic, so I'm reluctant to blame them.

Any ideas about what's causing this and how to fix it?
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post #2 of 10 (permalink) Old 09-25-2011, 06:19 PM
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Is the choke prime going back down when the choke is turned off? That would be the little valves on each carb that is moved when setting choke.

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post #3 of 10 (permalink) Old 09-25-2011, 08:23 PM Thread Starter
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yep, both look fine.
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post #4 of 10 (permalink) Old 09-25-2011, 08:47 PM
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Are those plugs really firing? If they aren't - or aren't consistently - you'll flood the cyl.

C
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post #5 of 10 (permalink) Old 09-25-2011, 09:49 PM
If only it had 6th gear..
 
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Quote:
Originally Posted by Crobins365 View Post
Are those plugs really firing? If they aren't - or aren't consistently - you'll flood the cyl.
I agree. If you're pretty sure your carbs have been cared for correctly I'd look at ignition in that front cylinder although you should notice a lack of power or stutter from the engine though. The only other thing is if for some reason fuel is continuing to flow into that cylinder for a few seconds after you shut it down. Doesn't seem likely though. Isn't the front carb the one connected to the petcock diaphragm? Maybe there's a problem there.

Dave

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post #6 of 10 (permalink) Old 09-26-2011, 08:39 AM
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Quote:
Originally Posted by drizdan View Post
Hi all,

So here's the current situation on my slow-to-restore Vulcan.

She starts up fine on the first go but once I kill the engine, it's flooded, but only on the front cylinder. The plugs are wet with gasoline and black from previous carbon fouling. When I let the engine and plugs dry out, she'll start back up again no problem.

The carbs have just been given an overhaul by a mechanic, so I'm reluctant to blame them.

Any ideas about what's causing this and how to fix it?
Sounds like your carb float is stuck open or the needle valve is not seating properly. You say the bike starts easily and back up again when dried out so I don't think it's an ignition problem.

JM2001

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post #7 of 10 (permalink) Old 09-26-2011, 11:26 AM
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What about the petcock? The diaphragm in mine was bad, causing it to flood out all the time. Have you checked the petcock?

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post #8 of 10 (permalink) Old 09-26-2011, 11:36 AM
Crap, I WAS in 5th gear.
 
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Check the float levels- it's easy to do, and at least you can rule it out.
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post #9 of 10 (permalink) Old 09-26-2011, 03:41 PM
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Are you using the run switch to kill the engine?... If so, try only turning the ignition off and leaving the run switch alone.
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post #10 of 10 (permalink) Old 09-28-2011, 03:34 PM Thread Starter
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Alright, so.

I changed out all the spark plugs and now she starts up well each time. But! In order to get the bike to run I need to start at about half choke, which feels wrong to me in 90 degrees New Orleans heat.

Also, I pulled the plugs and even though she's starting up reliably now (so it seems, for the moment at least) the plugs are still coming out wet and the brand new front cylinder plugs are already black with carbon fouling.

I feel like it's only a matter of time before it happens again, even if the bike is starting up now. Any ideas?

Oh PS - I was using the Run switch to kill the engine, and now am using the key. Is there really a difference in this?
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