Hesitancy, seems weird - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 23 (permalink) Old 04-30-2006, 06:56 AM Thread Starter
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Hesitancy, seems weird

Hey guys, I'm back with a new question. I noticed my bike is starting to act a little weird. In the past, I used to accelerate from first, shift at 4,000 which drops the rpms to around 3,000, and would often cruise in the city around 3,000 - 3,500 rpms. Now let me tell you what is happening.

I accellerate in first gear. Sudden or gradual, no problems. Upon reaching around 4,000 rpms, I shift to second. RPMs drop to around 3,000 for a moment but rise as I accelerate. 4,000 RPMs is reached again with no trouble and I shift again. Engine drops to 3,000 RPMs. I continue to accelerate. The bike reaches 40 mph at 4,000 RPMs or so in 3rd gear. I shift to 4rth gear. Engine drops to 3,000 rpms. At this poing, if I try to accelerate, the bike starts to "jerK" or "surge" or something, and you can hear the engine bog down a bit. If you try to go up even the slightest hill, or have a bit of a wind, you not only won't accelerate, but you might even slow down. You can roll on full throttle but it only feels worse and starts to bog down more.

If you downshift back to 3rd, the bike will continue to accelerate. If once you reach about 5,000 RPMs, you shift back to fourth, the rpms drop to 4,000, and the hesitancy is mostly gone, and it goes away as engine speed increases. Whats the problem? Like I said, I have no trouble with this in gears 1, 2 & 3. Idle is good and strong, with no problems there. I have not really looked to see what happens when I try to shift to 5th at 3,000 RPMs. This problem has come in sort of recently. Nothing was done to the bike, e.i. I didn't modfy anything, do anything, no accidents etc since before the problem showed itself to after it came up. I checked fluids and it all seems good. Can anyone help me?

Ben
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post #2 of 23 (permalink) Old 04-30-2006, 12:11 PM
 
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Things you can check:

1. Spark plugs "new or old"?
2. Add SeaFoam to the gas "get it at Napa Auto Parts"
3. Fuel/air mixture screw "has it been back out to 2 1/2 turns on the carbs?
4. Check carb boots and make sure they are tight.

Those are some things you can check for now.
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post #3 of 23 (permalink) Old 04-30-2006, 02:05 PM Thread Starter
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Carb boots are a good idea. I'll try that. I'll also get the sea foam. Figure those things are cheap and easily done. Thank you so far.

Ben
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post #4 of 23 (permalink) Old 05-01-2006, 10:26 AM
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sounds like a carb issue to me.....try the sea foam...

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post #5 of 23 (permalink) Old 05-02-2006, 03:04 PM Thread Starter
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Yeah, I just got some today. I poured it in the gas tank. I'll let you know how it works out. Thanks for your help.

Ben
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post #6 of 23 (permalink) Old 07-16-2006, 03:34 PM
 
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pretty much this same thing is happening to me this weekend with my 86 vulcan.. all is good until i am in 5th gear then it starts surging and lurching while i am holding a contstant throttle. if i really give it some throttle it usually does fine but when i am just cruising along its surging and lurching.
yesterday before this problem was happening i had just changed the oil and the gear oil and put some seafoam in the tank and fille dup. it was after that when this started happening. you think the seafoam knocked some crud loose or something? why would it only act weird in 5th gear?

thanks.
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post #7 of 23 (permalink) Old 07-16-2006, 03:44 PM
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Ben - Only 4th gear? That DOESN'T sound like a carb problem. Carbs don't care what gear you're in. That sounds like a transmission problem.

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post #8 of 23 (permalink) Old 07-16-2006, 05:19 PM
 
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When mine was doing this...turned out to be the vaccum line that goes to the RH air cleaner. I had replaced it during the rebuild and effectively plugged it by pushing it in too far. How to fix? Pull off RH air cleaner...cut end of tube at a diagonal...reassemble and test.

I wish I understood why this particular vacuum line has this effect...I don't understand, but it does. Can't hurt to try, right?
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post #9 of 23 (permalink) Old 07-16-2006, 08:20 PM
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Could this be the clutch slipping a little bit?
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post #10 of 23 (permalink) Old 07-16-2006, 09:03 PM
 
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Quote:
Originally Posted by Dan
Could this be the clutch slipping a little bit?
is there a fix for this or just a replacement?
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