Carb issues (I think) - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #1 of 13 (permalink) Old 04-16-2008, 03:10 PM Thread Starter
 
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Unhappy Carb issues (I think)

I am having issues with my 750. I got the bike(1990 VN 750)a couple weeks ago from a "friend". Its my first bike and I was thinking it was going to be magical. I was wrong. It lacked alot of power. I had many suggestions as to what it could be but nothing worked. I put some seafoam in the tank and then all hell broke loose. After that it started chugging and lurching. Then it died. Now, It wont even idle (when I can get it started). When I do start it the throttle has to be wide open. It usually takes a couple of tried to do this. It picks and chooses what day it wants to start up. Today i got it started (first time in 2 days) and I had alot of white smoke for about 10 minutes and it started back firing. I have tried carb cleaner but it hasn't worked after 2 cans. . Now I am desperate. I love riding but I can not right now with the problems I am having. Please help.
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post #2 of 13 (permalink) Old 04-16-2008, 06:39 PM
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Are you mechanically inclined?
Do you think you can handle pulling the carbs?

Of course you can!!
More than likely the carbs and internal parts need cleaned. Maybe the fuel tank & petcock also. Have you taken a look inside the tank to see it's condition?

The Seafoam was an excellent place to start. The carb cleaner...maybe not.
Some carb cleaners can have an adverse reaction to plastic parts in the petcock & carbs.
A good carb cleaning seems to be what you need.

Also, did you try changing the plugs at all?
What about the air filters? Are they clean?
Did the smoke smell like fuel, as in a flooded condition?

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post #3 of 13 (permalink) Old 04-16-2008, 09:33 PM Thread Starter
 
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I did pull the tank and cleaned the screens. I removed alot of junk from the tank as well. I have changes the plugs and it helped a little before it took a dive. And I do smell alot of fuel in the smoke. there are K&N type filters on it and they are clean.
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post #4 of 13 (permalink) Old 04-16-2008, 10:26 PM
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White smoke is usually an indication of coolant getting into your cylinders and burning off; but the fact that you're smelling fuel suggests otherwise. Your carb floats may be stuck, leaving the engine kind of overwhelmed with gas (which can leak out any number of places)...got any visible leaks at all, or just the smell? Also, when you changed the plugs, were they wet with gasoline?

As folks here have drilled into my head, you need three things to get the bike to start and idle: spark, fuel, and compression. Easiest thing is to see that you have spark at all four of the new plugs (could be a problem with a wire or two); then check the fuel flow - an air leak can severely impact the ability of the gas to move nicely through the system; and finally check the compression - there are tools you can use to check that, or you can pull the spark plugs and try the ol' "I guess this finger is an extra" test. More on that anon.


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post #5 of 13 (permalink) Old 04-17-2008, 06:25 AM
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Quote:
Originally Posted by Crobins365 View Post
"I guess this finger is an extra" test.

Now you have me curious .... never heard that one. But you're right about the whitew smoke, usually coolant with a "sweet" smell unless you have straight water in the system (naughty naughty but could be worse) Could also be water in the fuel, flooded smoke tends to be black, oil smoke is blue, or possible the carb cleaner is the source of the white smoke. I would say determine the source of the smoke and we can go from there. Check the coolant level and make sure you aren't losing any internally.

Last edited by dragon159; 04-17-2008 at 06:39 AM.
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post #6 of 13 (permalink) Old 04-17-2008, 06:44 AM
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I can't remember who suggested I do this, but it worked. I wanted to check the compression in O's cylinders. Pulled both spark plugs from one of the cyls, and moved the wires waaaaaaay far away from my person. Put one finger over one of the spark plug wells and cranked the engine. If you have compression (not necessarily enough, but compression), your finger will kinda blow off the hole that it was covering. Or maybe it didn't blow off; maybe I just got scared that I'd accidentally used a highly useful digit and yanked it off the engine as soon as I felt the pressure. At any rate, even if one loses a finger with that method, the good news is that you'll know whether or not there's compression in the cylinder!

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post #7 of 13 (permalink) Old 04-17-2008, 01:40 PM
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Just curious how much fuel was in the tank when you added seafoam? Hopefully you had a good amount of petro in there too.

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post #8 of 13 (permalink) Old 04-17-2008, 03:59 PM Thread Starter
 
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I have noticed a little bit of fuel collecting on the outside of the carb. I had nearly a full tank when I added the seafoam. My coolant level is fine. No changes there. Its not a sweet smell at all like coolant and its white smoke which may be the carb cleaner burning off and it just an overwhelming gas smell. Every time I pull the plugs they are wet with fuel. The engine also makes a completely different sound when I crank it without touching the throttle. It also backfires alot when I try to crank it.

Last edited by Trouble; 04-17-2008 at 04:02 PM.
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post #9 of 13 (permalink) Old 04-17-2008, 04:20 PM
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Sounds like you're just pouring the gas through your engine. The carbs need a rebuilt. Until you pull them and clean everything out and replace whatever is broke, you're just not going to have any fun.

How long has your "friend" had the bike in storage with gas in it before you bought it? That old gas could have gunked up and clogged everything.

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post #10 of 13 (permalink) Old 04-17-2008, 05:10 PM Thread Starter
 
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Just went out to my bike after sitting all day. It fired right up. It idled just fine. I tried a few things that others have mentioned("burping" turning petcock to off and letting it run out of gas and recranking it and doing it all over again) Don't know what it was for but I tried it. While that was going on it backfired a lot. Minimal smoke this time. As soon as I backed it out of the carport to try it, She died and would not re-crank. I mean it idled great for about 15 minutes that as soon as backed up it died.
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