Carb Stumble - Kawasaki Vulcan Forum : Vulcan Forums
 
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post #1 of 5 (permalink) Old 03-21-2018, 08:09 AM Thread Starter
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Carb Stumble

Hey guys, it's been a while.

I'm having an issue with the carb on my 98 VN800a. When I first roll on the throttle it stumbles a bit. It's at its worst when the bike is cold but even when warmed up doesn't respond quite the way it should. It rides and idles just fine. This only occurs while cold or just starting from a stop.

Now, I know there is an accelerator pump on this carb. My guess is that it's out of whack, but I'm not sure how to adjust it.

Thoughts?

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post #2 of 5 (permalink) Old 03-21-2018, 11:42 AM
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Could it be simple gas issues? As in, did you recently get gas from a different place? Or is it OLD gas?

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post #3 of 5 (permalink) Old 03-21-2018, 06:55 PM Thread Starter
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No this has been going on for a while, I just haven't had time to deal with it. Riding season is almost upon us and it's time to get its done before they season really kicks in.

It's really just a sputter. Not awful but it has caused some semi uncomfortable moments when making lower speed maneuvers.

Live a good life.
If there are gods and they are just, then they will not care how devout
you have been, but will welcome you based on the virtues you have lived by.
If there are gods, but unjust, then you should not want to worship them.
If there are no gods, then you will be gone, but will have lived a noble life
that will live on in the memories of your loved ones.
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post #4 of 5 (permalink) Old 03-25-2018, 07:32 AM Thread Starter
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I think I'll try richening the mix a little. Maybe that will sort it out.

Live a good life.
If there are gods and they are just, then they will not care how devout
you have been, but will welcome you based on the virtues you have lived by.
If there are gods, but unjust, then you should not want to worship them.
If there are no gods, then you will be gone, but will have lived a noble life
that will live on in the memories of your loved ones.
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post #5 of 5 (permalink) Old 03-27-2018, 01:21 PM
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Wait until your bike is warm then set idle to 1200-1300 rpm. If you don't have a tach, 1300 is not loping like a Harley and not like you have throttle on it) Then pull choke knob out 1/2 way and check for 'stumble'. Does it get better? If it gets better, you are enriching your mixture, so you either have a partially plugged pilot jet or you need a larger pilot jet in the long run). But for now, you can enrichen your mixture w/screw to make the stumble go away if it's not too far out of whack. Mine did the exact same thing and I ended up at 4 turns out. I eventually went to the next size pilot jet (50) and I was able to put the screw back to around 2. No more stumble after that.

Stock or aftermarket exhaust? It makes a difference on your fuel mixture screw setting and maybe your pilot jet. I'm assuming your carb is clean. I doubt it is your accel pump. You can easily check it to see.

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