Help please! Sputtering and no acceleration at all. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 19 (permalink) Old 08-27-2013, 04:44 PM Thread Starter
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Help please! Sputtering and no acceleration at all.

Well, we had some rain here this past weekend. My bike now starts up fine, but won't accelerate! When I give it some gas, it starts sputtering. I had to ride it to work, then to my other work place, then home, at around 15mph 'cause it wouldn't go faster. I turned it on last night and I thought it was revving up fine. At first there was a lot of sputtering then it went away and only a little was still there... but this morning it was really bad.

So... I'm thinking either electrical or carbs... any ideas? I'm about to head out and tear stuff down, it would be nice if someone can point me in some direction. Thanks for any input!

Oh... when I give it gas there's sputtering and also a lot of backfires and some explosions at the carbs. I even had one of the vacuum plugs on the carbs shoot off from one of those explosions.

1985 VN700 unknown mileage (over 33K)

AGM Battery
Iridium spark plugs
NGK wires and caps
Relocated R/R
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post #2 of 19 (permalink) Old 08-27-2013, 04:50 PM
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Well, we had some rain here this past weekend.
Says water to me bro....drain the tank into a clear clean glass 1 gal jug....you'll see water on the bottom if there is any....if not, you can put it back in...but thats my guess...SeaFoam or drygas "might" help if its just a lil...personally, Id wanna get it outta there....even draining a quart into a mason jar will show ya....water in gas always sits on the bottom....ask any pilot....



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post #3 of 19 (permalink) Old 08-27-2013, 04:52 PM Thread Starter
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Makes lots of sense... gonna take some out through the petcock and, since it sits at the bottom, I should get a lot of water. Be back in a bit with the results!

1985 VN700 unknown mileage (over 33K)

AGM Battery
Iridium spark plugs
NGK wires and caps
Relocated R/R
Marbled
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post #4 of 19 (permalink) Old 08-27-2013, 05:13 PM Thread Starter
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Nope, no water that I could find.

1985 VN700 unknown mileage (over 33K)

AGM Battery
Iridium spark plugs
NGK wires and caps
Relocated R/R
Marbled
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post #5 of 19 (permalink) Old 08-27-2013, 05:20 PM
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okay...if it aint that, you got pods ?....try runnin w/o....if it runs good, then ya need new pods....check yer oil level too to make sure its not too high...
Few weeks back, my float stuck, and dumped some gas into the crank...did the same thing too...drain it to 3/4 window (level) and try it....



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post #6 of 19 (permalink) Old 08-27-2013, 05:36 PM Thread Starter
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I have the stock air system with K&N filters. I'll check the oil level in a bit. Gonna grab something to eat before I head back out. I'm thinking maybe the spark plug cables have moisture? I think I have enough cable to make another set.

1985 VN700 unknown mileage (over 33K)

AGM Battery
Iridium spark plugs
NGK wires and caps
Relocated R/R
Marbled
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post #7 of 19 (permalink) Old 08-27-2013, 07:54 PM Thread Starter
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Well, I THINK I found it... Pulled the plugs on the RR and one was filled with water. I'm hoping drying this out fixes the problem. I need this bike ready for tomorrow morning!

1985 VN700 unknown mileage (over 33K)

AGM Battery
Iridium spark plugs
NGK wires and caps
Relocated R/R
Marbled
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post #8 of 19 (permalink) Old 08-27-2013, 09:04 PM Thread Starter
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Nope... that didn't help u_u I even found another junction box and replaced it and didn't help either. So the things I've checked are:

- No water in the fuel
- Replaced spark plug cables
- Dried out an RR plug that had a bit of water in it
- Replaced junction box

I still have no clue... took out the carbs. They do look dirty on the outside, but they always do :-/ ... ah well, I'll go get some carb cleaner and give them hell.

1985 VN700 unknown mileage (over 33K)

AGM Battery
Iridium spark plugs
NGK wires and caps
Relocated R/R
Marbled
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post #9 of 19 (permalink) Old 08-28-2013, 02:56 PM
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most likely result from rain would be corrosion.

I would check all connections including coils, grounds, and any other connections you can get your hands on.
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post #10 of 19 (permalink) Old 08-28-2013, 07:21 PM Thread Starter
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I did take a look at all the connections I could find, and gave a few of them a nice cleaning.

I still haven't cleaned the carbs, my work schedule won't allow it until tomorrow. But I think the carbs might be the problem... when I took them off, I could see many grains of sand at the carb intakes. I can only guess that there's gonna be a bunch of that inside too. I also found out that I forgot to put on the carb vent hoses... which means it's even more likely that water and dirt got into them.

1985 VN700 unknown mileage (over 33K)

AGM Battery
Iridium spark plugs
NGK wires and caps
Relocated R/R
Marbled
Ceal is offline  
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