Kawasaki Vulcan Forum banner

1 - 20 of 55 Posts

·
Registered
Joined
·
225 Posts
Discussion Starter #1
My bike will start and idle for a 5 minutes or so then die. I have replaced all fluids, replaced spark plugs, pulled and cleaned the petcock, replaced fuel. The only thing I have not done yet is pull and clean the carburetor. I am a novice mechanic I guess you could say. I am not sure I dare open up the carburetor. Trying to decide if I should give it a go or just take it to a shop. Any advice, experiences?

Thanks! (2000, Vulcan 800)
 

·
Registered
Joined
·
504 Posts
My bike will start and idle for a 5 minutes or so then die. I have replaced all fluids, replaced spark plugs, pulled and cleaned the petcock, replaced fuel. The only thing I have not done yet is pull and clean the carburetor. I am a novice mechanic I guess you could say. I am not sure I dare open up the carburetor. Trying to decide if I should give it a go or just take it to a shop. Any advice, experiences?

Thanks! (2000, Vulcan 800)
Around here, it's $350-400 for a carb rebuild. I had the same mechanic do the rebuild on my 05 VN800B when I got it in 2010 (it had sat for 4 or 5 years). Haven't had to open it up since. Well worth having a pro handle it, in my opinion.

After the rebuild, remember to put fuel stabilizer in the tank (I use Spectro) when the bike will sit for a while.

Now for the diagnostics ... when you say the bike dies, does it rev up and then die, or bog down and die? The former is too lean, the latter too rich. It sounds like a lack of fuel pressure, so there's either a pinhole in the fuel line, a leak in the carb, or the petcock isn't quite clean enough.

-John
 

·
Registered
Joined
·
225 Posts
Discussion Starter #3
So I will fire it up with the choke out and it will run which sounds fine. I push the choke in about half way and let it run. It does rev up but I have assumed its because I have the choke on. It will run for about 5 min or so and then bog down and die. After that it if I restart it, it will only run for a min or two before bogging down and die. When I pulled the petcock last night I did notice a tiny crack in the fuel line right as it comes off the petcock. It wasn't big enough to leak fuel but maybe for air to get in the line? I cut that portion of the fuel line and hooked it back up the rest of the hose looks okay. I haven't fired it up after doing this, but maybe I should. What do you think?
 

·
Registered
Joined
·
11,756 Posts
17 years old....time for the carb to be torn down, cleaned, inspected, any suspect parts replaced and adjusted to Kawasaki specifications.

Get a service manual and with forum help, you should be able to do the job.
An excellent learning experience.
 

·
Registered
Joined
·
504 Posts
It has 20K miles and was sitting in a garage for about a year and a half.
My wife's bike was 13 years old and had 6500 miles on it, and had sat for 3 months ... needed a carb rebuild.

Just do it, it'll make the bike happier.

-John
 

·
Registered
Joined
·
225 Posts
Discussion Starter #7
I feel okay about pulling the carb and cleaning it but if something is bad I am worried I may not know just from looking at it.
 

·
Registered
Joined
·
225 Posts
Discussion Starter #8
One more thing to note. The other day I ran the bike on Prime for a bit and after a few minutes gas started coming out of the Carb. Is this normal for the prime position? I know its flows freely in Prime so I thought maybe it wasn't that surprising.
 

·
Registered
Joined
·
814 Posts
(I wrote the following before reading your last post, so you definitely have a problem with your carburetor. Do as sfair suggests)

KD, I agree the carburetor is due for a good cleaning and adjustment, but reading your original post, one thought came to mind. On the surface it sounds like the carb bowl is filling up too slowly. Five minutes is a long time, so some gas is getting to the carb bowl. If your petcock has a "Prime" position, that position allows gas to free flow to the carb. Try the prime position and see what happens. If the engine runs normally, then there may be a problem with the petcock when in "Run" position. If the engine has the same problem in prime position, then remove the petcock rubber hose and check for free flow of gas. If there's just a trickle flowing, then I'd assume there's a restriction in the petcock itself or some crud in the tank fouling the petcock gas intake filter screens.
 

·
Registered
Joined
·
225 Posts
Discussion Starter #11 (Edited)
Redfish, I ran the bike in Prime and it ran okay. After a few minutes in Prime gas began flowing out of the Carb. Last night I pulled the petcock and cleaned it, it wasn't that dirty at all really. The Prime position definitely flows fine as I drained the tank in about 5 minutes. As noted: I did see a crack in the fuel line just below the petcock. No fuel was leaking from it but wonder if air was getting in the hose. I cut the hose off and hooked it back up but haven't ran it yet to see if that was a big issue. Should the bike leak fuel out the carb in the prime position?

(Sounds like I definitely need to pull the carb. Other than cleaning it I am not sure what to look for. I have the manual and youtube I guess. lol)
 

·
Registered
Joined
·
814 Posts
Should the bike leak fuel out the carb in the prime position?
Definitely not. YouTube, a service manual, and help from forum members I'm sure will be enough for you to get the carburetor in good condition. I can't be much help though, but I'm sure sfair and others will be.
 

·
Registered
Joined
·
234 Posts
Don't waste Your money on carb rebuild kits before taking it apart!!!
In most cases the only reason for carb overflow is the carb float needle which does not turn off the fuel.
Second most common reason is the float chamber gasket. In Your case the gasket should be ok, because nobody did touch it.
Just take it apart, wash it, clean it and inspect it. No need to throw out money for not knowing the leaking reason.
 

·
Registered
Joined
·
225 Posts
Discussion Starter #16
Good Point Tehnis thanks! It only leaked the one time on Prime. I have ran it quite a few times since in the on position for a few minutes and haven't seen any overflow.
 

·
Registered
Joined
·
234 Posts
Your are welcome! :)
It should not flow over even on prime, because the float needle should close the incoming fuel line in any case. Well, in any correct case, when the float is correctly adjusted and has no leaks in it. I mean leaks in float itself which could mess up floating hight.
There's a great video on this. Just watch it how it works. In Your case You should not make any level adjustments! First You just need cleaning!
 
1 - 20 of 55 Posts
Top