Please help! My bike is sputtering at 45+mph. I don't feel safe on it. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 06-25-2012, 06:14 PM Thread Starter
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Please help! My bike is sputtering at 45+mph. I don't feel safe on it.

Hey guys, here I am again. I have an issue that I have had since my bike was brought home. When I got my bike, I wasn't comfortable driving the distance from the old owners house to mine so I had him drive it back. He was going 40mph the whole way which I thought was because he wasn't comfortable going fast. He had put less than 200 miles on the bike under his ownership. I'm the 3rd owner. I decided to bring it to a mechanic for a full tune up and everything. He called me back and told me that the bike would sputter. I got it back after a month and I noticed that when I took the bike out, it will still do it! The mechanic emptied the tank and everything a few times, new plugs, cleaned carbs, changed, filters. Why is my bike still doing this? I am such a new rider and I am afraid of my bike because of this. I am not afraid of riding a motorcycle but I don't feel safe when it sputters. I am so upset over this because I made a rookie mistake and got taken.
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post #2 of 8 (permalink) Old 06-25-2012, 06:20 PM
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Does it matter what RPM range? Or just any time over 40?

If if's just any time over 40, it sounds like the carb vent hose that usually goes to the right ear is flopping in the wind. Cut the end of it 45 degrees and place it back in the right ear. A search will prob turn up some pictures.

1986 Kawasaki Vulcan 750
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post #3 of 8 (permalink) Old 06-25-2012, 06:42 PM
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I know the "not feeling safe" because of the same problem. After my deployments my bike did the same thing. I did the carb hose trick perscribed by everyone here and it helped a little (though I still had OTHER issues). But this last time I came back was the worst and what it finaly took was a realy big dose of seafoam and a 16 hour balls to the wall trip from VA to FL. The frist few hours sucked, didnt feel safe, had no get up and go. But then things just seemed to loosen up and after about the fifth hour I was humming beautifuly at 85-90 with the rest of trafic. Not a hickup or sputer to be heard now.

Not saying this will work for you or that you should ride when you dont feel safe but if you can get out and realy get on it for a little bit at a time, then it might clear up for you.

Of course you should listen to some more knolegable guys on here before my idea, I just didnt have a lot of time to tinker or fix anything. So I made it work to get down here.

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post #4 of 8 (permalink) Old 06-25-2012, 06:53 PM
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Quote:
Originally Posted by thtanner View Post
Does it matter what RPM range? Or just any time over 40?

If if's just any time over 40, it sounds like the carb vent hose that usually goes to the right ear is flopping in the wind. Cut the end of it 45 degrees and place it back in the right ear. A search will prob turn up some pictures.
X2 or a clogged main jet. Try some SeaFoam as suggested.

JM2001

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post #5 of 8 (permalink) Old 06-25-2012, 07:04 PM
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My bike had issues with sputters and power issues also. I took it to a friend's shop and he cleaned out my petcock. It fixed the problem... for about a week. then I cleaned the petcock again and tossed in some Seafoam and have been riding the crap out of it. Rides like a charm now. It turns out, the guy I bought it from let it sit for about 8 months. so I had some gunk in the tank.

If you own a Clymers manual, it shows how to dissemble the petcock, it takes minimal tools, time and skill... try it first.

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Last edited by Chris32250; 06-25-2012 at 07:53 PM.
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post #6 of 8 (permalink) Old 06-25-2012, 07:49 PM
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Quote:
Originally Posted by LesPaulPlayer View Post
Hey guys, here I am again. I have an issue that I have had since my bike was brought home. When I got my bike, I wasn't comfortable driving the distance from the old owners house to mine so I had him drive it back. He was going 40mph the whole way which I thought was because he wasn't comfortable going fast. He had put less than 200 miles on the bike under his ownership. I'm the 3rd owner. I decided to bring it to a mechanic for a full tune up and everything. He called me back and told me that the bike would sputter. I got it back after a month and I noticed that when I took the bike out, it will still do it! The mechanic emptied the tank and everything a few times, new plugs, cleaned carbs, changed, filters. Why is my bike still doing this? I am such a new rider and I am afraid of my bike because of this. I am not afraid of riding a motorcycle but I don't feel safe when it sputters. I am so upset over this because I made a rookie mistake and got taken.
I have the same exact issue now. It won't cruise above 40-45 @about 3k. It will rev above fine and take off fine over that, but then it will starve for fuel shortly after. I'm working on another section of the bike or two before I start trouble shooting it. I have new and clean everything, vent, intake, jets, plugs petcock etc... I'm not sure if I have to swap main jets, adjust floats or what yet. I have clear fuel lines now, I'm going to swap back to regular rubber cause they are starting to kink already, but have noticed something odd. Sometimes the lines have air in them and once thought that might be the problem. One day I bleed the lines and it didn't solve it. Sometimes I can go look at them and there is nothing in them at all and will start and run just fine, all hoses are snug and don't think any is getting air leaks.
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post #7 of 8 (permalink) Old 06-28-2012, 05:11 PM Thread Starter
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Sorry it took me so long to respond back in here. Been busy. I got the Seafoam as recommended and also picked up a MagnaPower ETX15L battery because I killed mine. I picked it up yesterday. I put some Seafoam in my tank today and rode about 15 miles around. You guys are awesome. I still need to check out the carb vent hose. I'll do the search. Do you know some other good spots to spray the Seafoam for our bikes? I got both the liquid and the spray version. Haven't tried the spray yet.

Last edited by LesPaulPlayer; 06-29-2012 at 01:49 AM.
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post #8 of 8 (permalink) Old 06-28-2012, 09:11 PM
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Quote:
Do you know some other good spots to spray the Seafoam for our bikes?
You can add a few ounces of SF to the crankcase oil and ride for a few miles (or all day long, depending on who you ask) before draining the oil for a change.

Quote:
I still need to check out the carb vent hose
Diagram for vent hose placement:
https://www.vn750.com/photopost/showp...o=1757&cat=503

Vent hose goes in slotted hole:
http://www.flickr.com/photos/leekayd...7600772238066/

Gordon

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TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html
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