rsavant - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
All fuel system discussion

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post #1 of 23 (permalink) Old 11-18-2013, 09:34 PM Thread Starter
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Hey guys, new to the forum. I recently purchased a 2002 VN750 after not riding for about thirty years. I'm really enjoying the bike. So here's my problem: at cruise speed, 55 to 60 mph, the engine will stumble a bit much like its running out of fuel. Opening the throttle a bit or adding slight choke and it runs fine again. I spent about 6 hrs removing and cleaning the carbs, which didn't seem very dirty. They'd been cleaned by the dealer before my purchase but the bike had been sitting for a while. While I think the bike runs better, it still has the stumbling problem. I've read about the POOG symptom and I'll try filling the tank and see what happens. Any ideas? Sorry for the lengthy post! Thanks.
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post #2 of 23 (permalink) Old 11-18-2013, 10:08 PM
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Try using some Seafoam in the fuel tank for a few fillups. Seafoam is the miracle fluid of this forum and cleans up those carbs and everything else.

Since you are new to the forum how about letting us know where you are from and possibly posting a few pictures of your bike. Also as you are returning after a considerable length of time away from two wheels let us know what you were riding before. There is a lot of experience here and any problem you may run into with the VN750 I am sure this forum will come up with a solution. I doubt if there is anything new about this particular bike that hasn't been dealt with by at least one of our members. Try the Seafoam and I am sure a more knowledgeable member will chime in very soon on other possible cures. Good luck and welcome.

and always remember, "Ride until you rot!"
**Really not sure if the Big "C" is back right now
but having to face the fact that this is a lifetime routine
going forward. Five operations done and it still continues.

Tom
Vulcan 2000
New ride: 2009 Victory Vision Arlen Ness Signature Series
4507 miles

Last edited by Vulcan2000; 11-18-2013 at 10:11 PM.
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post #3 of 23 (permalink) Old 11-18-2013, 10:31 PM
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Welcome to the forum brother! Good luck!
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post #4 of 23 (permalink) Old 11-18-2013, 10:51 PM
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X2 on the seafoam, might also want to check your plugs.


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post #5 of 23 (permalink) Old 11-19-2013, 06:09 AM
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Tell us more about your bike. Is it stock or has it had modifications?
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post #6 of 23 (permalink) Old 11-19-2013, 06:42 AM
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Air filter?

If it's got a foam air filter,you might try some light machine oil on the foam, helps with the vacuum. Supposed to clean and re oil them, from time to time.
Enjoy the ride.

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post #7 of 23 (permalink) Old 11-19-2013, 10:04 AM
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this symptom sounds like the vcrb vent is not properly shielded from the "wind".

There are 2 vent lines from the carbs that go to a "T" connection and on a stock bike, they are routed to behind the right side air filter box.

There are SLOTTED holes on the back of the "EAR" or air filter box that the hose gets inserted into to protect it from airflow.
The hose should be cut on an angle so that it does not bottom out. The slits in the hole that the hose goes into allows it the vent without getting air pressure of vacuum from airflow at speeds.

If the bike is modified and the filter pods were removed and replaced by the "EAR SHAVE" mod, then the hose should be stuffed up under the tank or inside the frame someplace to shield it from wind.

Last edited by kc2dgq; 11-19-2013 at 10:10 AM.
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post #8 of 23 (permalink) Old 11-19-2013, 09:36 PM Thread Starter
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The bike is stock, no performance mods of any kind. It has a fuel starvation problem, I was able to prove this today by running it with the choke on. It ran smooth as could be with the choke and had practically no popping when the throttle was closed. Are the adjustments on the carbs more for low speed?
Thanks for the welcome and the help. I'm really glad I found the forum. Also, someone asked where I'm located. That would be middle Georgia.
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post #9 of 23 (permalink) Old 11-19-2013, 09:48 PM
..have a vulcan good day!
 
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Quote:
Originally Posted by rsavant View Post
The bike is stock, no performance mods of any kind. It has a fuel starvation problem, I was able to prove this today by running it with the choke on. It ran smooth as could be with the choke and had practically no popping when the throttle was closed. Are the adjustments on the carbs more for low speed?
Thanks for the welcome and the help. I'm really glad I found the forum. Also, someone asked where I'm located. That would be middle Georgia.

sounds like in need of a possible carb cleaning...maybe Seafoam will perform the need/improvement.
....others will/may give better/added advice.

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
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...have a vulcan good day!

Last edited by WilliamTech; 11-19-2013 at 09:51 PM.
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post #10 of 23 (permalink) Old 11-20-2013, 07:16 AM Thread Starter
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I'd tried Sea Foam and the problem persisted so with the help of a friend we pulled, disassembled, and cleaned the carbs, which seemed pretty much clean to begin with. I think the bike accelerates a little faster but the stumbling and popping seems a little worse. I'm thinking there is an air leak or something else going on since the problem now seems worse. It runs perfectly with the choke on at cruise speeds. Getting the carbs off and on is a pain! I'll get a shop manual before I do that again.
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