odd acceleration issue - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 17 (permalink) Old 04-10-2017, 05:58 PM Thread Starter
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odd acceleration issue

Last year on a really hot day, I was left work everything running fine. I went to an event and it sat for about an hour. I went to start it, it wouldn't start, just crank and crank and crank. I finally got it started but it was running like complete crap. I would rev, but when I would accelerate beyond a few thousand rpm's. I nursed it home ( only a few blocks). I started to drain the gas thinking it was bad gas, towards the end I started it to get all the gas out of the, it started right up drove it around the block everything was fine......

Fast forward until yesterday.....

I took it out on Saturday, everything ran fine. Drove it about 50 miles or so. Sunday I took the bike out of the garage, it sat outside for about 20 minutes, (80 degrees F). Wouldn't start again... finally got it started, same thing. It drives like I have the choke out one notch. Then suddenly, runs fine, then starts acting up again. I'm completely lost on this one... The only thing I can think of is something in the carburetor is stuck.

Thoughts?
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post #2 of 17 (permalink) Old 04-10-2017, 06:03 PM
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Originally Posted by drwoo View Post
Last year on a really hot day, I was left work everything running fine. I went to an event and it sat for about an hour. I went to start it, it wouldn't start, just crank and crank and crank. I finally got it started but it was running like complete crap. I would rev, but when I would accelerate beyond a few thousand rpm's. I nursed it home ( only a few blocks). I started to drain the gas thinking it was bad gas, towards the end I started it to get all the gas out of the, it started right up drove it around the block everything was fine......

Fast forward until yesterday.....

I took it out on Saturday, everything ran fine. Drove it about 50 miles or so. Sunday I took the bike out of the garage, it sat outside for about 20 minutes, (80 degrees F). Wouldn't start again... finally got it started, same thing. It drives like I have the choke out one notch. Then suddenly, runs fine, then starts acting up again. I'm completely lost on this one... The only thing I can think of is something in the carburetor is stuck.

Thoughts?
sounds like a fuel issue,lots of help Here,Didn't say what your Ridn
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post #3 of 17 (permalink) Old 04-10-2017, 06:07 PM Thread Starter
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DERP.....

2008 Vulcan 500

Clearly, I need more coffee... more sleep... more alcohol.... something.
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post #4 of 17 (permalink) Old 04-10-2017, 06:10 PM
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Originally Posted by drwoo View Post
DERP.....

2008 Vulcan 500

Clearly, I need more coffee... more sleep... more alcohol.... something.
lol,Hopefully Bikerbill will chime in,king of 500,know these bikes inside out
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post #5 of 17 (permalink) Old 04-10-2017, 06:13 PM Thread Starter
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Its just a really odd issue, I bet if I let it sit for a few days it'll go back to normal again.

I love my bike, but some days...... lol
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post #6 of 17 (permalink) Old 04-10-2017, 06:17 PM
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Clearly there is a problem,would start w fresh gas and some seafoam,Have a fuel filter on it?
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post #7 of 17 (permalink) Old 04-10-2017, 06:38 PM Thread Starter
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Nothing beyond stock. So I would guess there's one somewhere. I do have the Haynes book to it so I will look at that to see where it is.
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post #8 of 17 (permalink) Old 04-11-2017, 06:30 AM
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This is a 'Shoot from the Hip' approach because we can't easily recreate the problem for proper troubleshooting. Unless the problem can be recreated I'm going to make a couple of suggestions:

You say in both instances that it sat outside for a time before giving trouble. I assume that this was in the bright sunshine. It could be that the sunshine was warming the tank and fuel, pressurizing it through a faulty tank vent. This could override a carburetor float valve, therefore flooding it and the airbox. Check the airbox drain tube in front of the rear tire and drain it. (it's the one with that's plugged and has a plastic tank at the bottom of it.) Also check the oil level, it could be contaminated with fuel. If it is change the oil and filter too.

Try this to see if the tank is pressurizing: put the bike out in the sunshine (with at least 1/2 tank of fuel) for 20-30 minutes then open the cap. If you get a large rush of air outward when you open it the vent assembly is probably faulty. There is no official test. The vent assembly is inside the fuel cap and is cleaning it is not listed in the Service Manual. But with a bit of care it can easily be disassembled, cleaned, and reassembled. Take pictures!

The other idea is that, along with the above, one of the spark plugs may be fouling. I had problems with the stock DR9EA spark plugs early on so I switched to the slightly hotter DR8EA spark plug. It is listed as an alternative spark plug for the bike.

Hope this helps.
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'97 EN500LTD 'Hidalgo' 189,000+ miles so far
'98 EN500LTD 'Sioux' 18,000 miles so far
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post #9 of 17 (permalink) Old 04-11-2017, 10:44 PM Thread Starter
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Thanks for the information.....

I have some great starting points for this weekend.

I did think about the seal on the tank, and it doesn't pop or anything like that when I open the lid, HOWEVER, I have heard it "whine" when it's out in the sun before, or right after I rode it, it makes a whine or squeal very faint, and it's from the gas cap for sure. I will certainly check those other things and take some pictures as well.
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post #10 of 17 (permalink) Old 04-12-2017, 05:57 PM Thread Starter
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So I checked the tank today, no puff of air or anything like that. I does smell gassy though. So I would have to agree that it's flooding or at least acting it does. I haven't messed with the airbox yet, partially because I don't know where it is. I see 1 clear tube and 2 black tubes. I know, that's terrible. I usually just take it in when I need work done on it. But I did notice something on the left carb. See the attached picture.

https://www.dropbox.com/s/dfler86m1r..._0714.JPG?dl=0
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