Delemma - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #1 of 28 (permalink) Old 06-19-2007, 12:31 PM Thread Starter
 
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Unhappy Delemma

Okay took the 96 Vulcan 750 to get inspected today and noticed that it seemed to be at a loss of power. Tried starting out in first gear and felt like fourth gear. Got out on the highway and opened the trottle an it had no power and would not go past 5000 RPMs. I just recently purchased the Vulcan and it set for 4 yrs. Here are the things that I have done so far.
1. Added Sea Foam to gas when first purchased and continue to do so
2. Changed plugs, oil and filter
3. All four plugs are firing (tested)
4. Starts great don't even need to choke it all the way
5. Idles at 750 no backfiring when riding
6. Changed ACCT springs no knocking
7. No gas leaking out of overflow tubes
This really has me stumped it seems as though the bike has no get up and go, rides like a moped. As I stated there is no backfiring just lack of power and not going over 5000 RPMs. Is there anyway that I can check to see if the cylinders are getting fuel it seems as though it is running on two cylinders, you know that lack of power sound in the exhaust that you just know it is not getting its full potential in power. Any help would be great I am ready to ride but not a moped. Thanks for any help in solving this problem.

Bill
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post #2 of 28 (permalink) Old 06-19-2007, 01:24 PM
 
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you might try checking the carb vent hose that goes into the right air filter housing. Take the hose out and cut it at a 45 degree angle and then reinsert it. Mine was having the same problem and seemed like it was starving then thanks to this site I tried that and it ran perfect. Seems to be a pretty common problem. Do a search on vent tube or similiar for more info or wait for some other replys. Here's one thread on it: https://www.vn750.com/forum/showthrea...ight=vent+tube
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post #3 of 28 (permalink) Old 06-19-2007, 02:44 PM Thread Starter
 
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Well took the covers off the filters and noticed the filters are just crumbling apart, could this be the cause? I checked all the hoses and everything seems fine but will probably end up replacing them due to how long it sat for.

Bill
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post #4 of 28 (permalink) Old 06-19-2007, 03:48 PM
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Quote:
Originally Posted by dogedog View Post
Well took the covers off the filters and noticed the filters are just crumbling apart, could this be the cause? I checked all the hoses and everything seems fine but will probably end up replacing them due to how long it sat for.

Bill
I was jsut going to suggest you do that, but then realized there were a couple of posts after your initial one. Yes, indeed, that can cause all kinds of trouble - your carbs need good, clean air to run properly. Change the filters (and maybe see if there's any junk in your ducts and airbox), and see if things run a little better.

C
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post #5 of 28 (permalink) Old 06-20-2007, 05:14 AM
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noticed the filters are just crumbling apart, could this be the cause?
As I've mentioned here a few times, when I rode with the filter covers removed, the bike ran just fine....... up until around 4000rpm's.

Hopefully replacing the filter's will fix things right up for ya.


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post #6 of 28 (permalink) Old 06-20-2007, 06:05 AM
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Hyper, do you remember a post...maybe from last summer...where someone said s/he used material from an old t-shirt as a substitute? I recall someone else saying, "What are you doing?!", but I was thinking Bill could do that until he gets some real filters from the dealer. Definitely not a long-term solution, but short-term?

C
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post #7 of 28 (permalink) Old 06-20-2007, 06:19 AM
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Hyper, do you remember a post...maybe from last summer...where someone said s/he used material from an old t-shirt as a substitute? I recall someone else saying, "What are you doing?!", but I was thinking Bill could do that until he gets some real filters from the dealer. Definitely not a long-term solution, but short-term?
With the filters crumbling apart, if I were to try that, I'd put the material on both sides of the filter, to keep pieces from getting into places it shouldn't be.
And it was Artman who did that. HERE is the post (second down from the top)


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Last edited by hyperbuzzin; 06-20-2007 at 06:21 AM.
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post #8 of 28 (permalink) Old 06-20-2007, 06:24 AM
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Dag, that was quick! I need some journal articles - can you search a couple of databases and have the pdfs to me by, oh, 6.30 am?

You're awesome, Hyper, thanks! Bill, check the thread and see how Artman did it.

C
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post #9 of 28 (permalink) Old 06-20-2007, 06:39 AM
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Dag, that was quick! I need some journal articles - can you search a couple of databases and have the pdfs to me by, oh, 6.30 am?

You're awesome, Hyper, thanks! Bill, check the thread and see how Artman did it.

LOL, well, it's after 6:30 now, I might have trouble going back in time !! LOL


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post #10 of 28 (permalink) Old 06-20-2007, 10:39 AM
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Actually that tee-shirt thing worked pretty well. Never had any intake problems. Pull off the foam and fit the cut material around the screen and secure at the base with thick rubber bands. Two layers of material works fine


PS. I now have UNI PODS on, along with the ear shave.

Last edited by artman; 06-20-2007 at 10:42 AM.
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