engine idles ok, cuts out and bogs down when accelerating - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 23 (permalink) Old 05-07-2013, 09:10 AM Thread Starter
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engine idles ok, cuts out and bogs down when accelerating

I have a '94 vulcan with about 25K miles. The bike has been running great with a couple of exceptions, which I'll explain shortly. The other day I was out for a ride for about an hour and I was cruising down the highway when suddenly, the engine started bogging down, losing power but not dying. After pulling over, the bike was still idling but would cutout when I gave it the throttle. I wasn't out of gas, I knew there was gas in the tank, but I switched to reserve and still no change. So I struggled to drive it about 10 miles back to the house. So now the bike still idles OK but cuts out when I give it the throttle.

But about 3 weeks ago it did the same thing while I was cruising down the highway but it only lasted about 1-2 minutes and it cleared up and was running OK again. I thought it was maybe bad gas. And about 3-4 months ago it did the same thing for about 1 minute, but then cleared up.

I've now replaced the spark plugs with no change, the old ones looked OK anyway. So I figure it could be a carb issue or a spark issue.

Is it possible that a coil or wire could give out at increased rpms but be ok while idling?

Does this problem sound like a carb issue even though the problem happens suddenly?

I appreciate any help, I really love this bike, other that these couple of issues I haven't had any problems with it, but now this has happened.
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post #2 of 23 (permalink) Old 05-07-2013, 09:29 AM
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Check the Carb. vent tube in the right breather box, if not already done cut the tip at a 45* angle and replace in slot... Do the easiest & cheapest first...lol...
PS-Just noticed your first post... WELCOME...
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Last edited by Old Dog; 05-07-2013 at 09:35 AM.
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post #3 of 23 (permalink) Old 05-07-2013, 10:01 AM
..have a vulcan good day!
 
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Check for a possible POOG's issue.

+1

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
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Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
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post #4 of 23 (permalink) Old 05-07-2013, 05:01 PM
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I had this problem. It would run good at the start. And than it would start to run on one cylinder. I found a bug in the petcock and some dirt in the carbs. Cleaned it up runs great.

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post #5 of 23 (permalink) Old 05-07-2013, 06:19 PM
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My first thought reading your description was POOGS. If it was the hose in the right ear it wouldn't go away, I don't think. But checking that hose and cutting at a 45* angle is just a good thing to do anyway.

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post #6 of 23 (permalink) Old 05-07-2013, 06:35 PM
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I don't think it's POOGS, either. Otherwise, you'd have more often. I'd say, drain the tank tank, pull off petcock and inspect and clean it. Then check your fuel lines for blockages. Another to try is back blowing the float bowls. There is a sticky on that under the carbs section.

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post #7 of 23 (permalink) Old 05-07-2013, 06:59 PM
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Quote:
Originally Posted by Deviate View Post
My first thought reading your description was POOGS. If it was the hose in the right ear it wouldn't go away, I don't think. But checking that hose and cutting at a 45* angle is just a good thing to do anyway.

And welcome!
Exactly, and about the easiest thing to do first...
Have a good one...Old Dog...

Southern Central Tennessee.......
Now on the Dark Side......
Girl's Bike 09 Sporty xl 1200 Custom...33k + & clickin......
Sportster Owner/Rider since age 72...lol... Rider since Simplex...???
09-xl1200 "C" Vivid Black, Cast wheels w/19" Frt., SE-Stage 1+, X14iEDs...
MicroTach +, Higher wider H-bars, GPS Mt., Mustach bar Hwy. pegs...
Viking Shock cutout Saddlebags, Rear Mt. Signal Lt. Kit, Fork Brace...
RoadKing Air Shocks, Mustang Seat, Progressive Fork Springs...
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post #8 of 23 (permalink) Old 05-08-2013, 09:04 AM Thread Starter
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tried the cut, still the same

thanks for all the great tips, I cut the hose to a 45 degree angle, no change. So I removed the gas tank and opened the petcock to the normal centered position and sucked on the third outlet. Gas came out readily from one of the spouts but the other spout it just kind of dribbled out. Not sure if that's a valid test but I think I'm going to remove the petcock and make sure it's all clean. Dealing with the carbs will be a last resort, carbs and I don't get along too swell. I'll keep updating, thanks again.
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post #9 of 23 (permalink) Old 05-08-2013, 11:40 AM
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next time it happens...open the gas cap.
if it is POOGS, that will allow air into the tank...which in turn will allow fuel to flow again properly.

It's a very simple test....even easier if you have a spare key in the tank cap so you can do it while still running at speed.
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post #10 of 23 (permalink) Old 05-08-2013, 11:48 AM
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Quote:
Originally Posted by rickster View Post
thanks for all the great tips, I cut the hose to a 45 degree angle, no change. So I removed the gas tank and opened the petcock to the normal centered position and sucked on the third outlet. Gas came out readily from one of the spouts but the other spout it just kind of dribbled out. Not sure if that's a valid test but I think I'm going to remove the petcock and make sure it's all clean. Dealing with the carbs will be a last resort, carbs and I don't get along too swell. I'll keep updating, thanks again.
Both outlets should have same amount of fuel pouring from them when vacuum is applied. If cleaning doesn't resolve things, disassemble the gas cap and clean out the shallow channels with a solvent like brake cleaner. Lube the tumbler mechanism while your in their, too. Doesn't take much torque to distort the keys. Even a slight twist will prevent the ignition from working. AND DON"T LOSE THE SPRINGS!

I only understand what I don't understand.
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