dead spot in acceleration - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 16 (permalink) Old 09-12-2016, 03:25 PM Thread Starter
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dead spot in acceleration

My bike has developed a dead spot or almost like it cuts out for a split second under aggressive acceleration just off the closed throttle position. Makes no difference what gear I'm in, or what speed. If I let off the throttle, then hit it rapidly from a closed throttle position it has this symptom.

If I ride "non-aggressively" and just slowly/ smoothly roll onto the throttle I don't notice, however if I "nail it" I get this annoying symptom.

Anyone else experienced this, or have ideas what is causing it?
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post #2 of 16 (permalink) Old 09-12-2016, 03:35 PM
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Are there deposits in the throttle body preventing the butterflies from moving freely?
If so, a good cleaning might fix the problem.
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post #3 of 16 (permalink) Old 09-12-2016, 03:46 PM
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What RPM.... 1700 or 2200 Are the temps up past center? Fan on?

Gary

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2009 Kawasaki Voyager
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post #4 of 16 (permalink) Old 09-12-2016, 04:00 PM Thread Starter
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I took the right side dog bowl off and the throttle plates looked clean and move free.

2012 Vaquero SE aka "The Hulk"
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custom receiver hitch
custom passenger backrest and rack w/ Mustang pad
Mustang Vintage Touring seat w/ driver backrest
Kawi passenger foot boards
Kawi 12V outlet and aux adapter
Clearview shield w/ vent
Kury Longhorn Offset Hiway pegs (chrome)
Kury ISO grips (black) modified by RacnRay
Kury ISO (black) throttle boss
Kury Scythe mirrors (black)
Vance and Hines 2 into 1 Pro Pipe
Michelin Commander II's
VBA #03472 / VROC #37988
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post #5 of 16 (permalink) Old 09-12-2016, 04:05 PM Thread Starter
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Quote:
Originally Posted by GGB6259 View Post
What RPM.... 1700 or 2200 Are the temps up past center? Fan on?

Not sure what you are asking...
The fan does not come on when I'm going down the road, my temp (on a warm day) is usually near center.

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custom receiver hitch
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Kury ISO grips (black) modified by RacnRay
Kury ISO (black) throttle boss
Kury Scythe mirrors (black)
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Michelin Commander II's
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post #6 of 16 (permalink) Old 09-12-2016, 05:52 PM
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The ecu goes into safe mod at some point and I had a stumble when this would occur. Might be gas related as well. You running 89, 91 or 92. Mine did it for a bit then it disappered. Mostly at 1700 rpm.

Gary

SW Michigan

2009 Kawasaki Voyager
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post #7 of 16 (permalink) Old 09-12-2016, 11:54 PM
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Mine had a stumble to it at low rpms, under 2200 or so when I had a speedometer correcter on it. After removing it, I have not had the stumble since. This is on a 2012 Voyager. I have a Gman fuel controller and drilled baffles from my stock pipes. I did have a Thunder stock air kit on for a couple years but removed it last spring and went back to stock intake.

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post #8 of 16 (permalink) Old 09-13-2016, 07:40 AM
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The stumble can be fixed by getting the ecu flashed by Ivan. Look him up here you will se what I'm talking about. It's the best money you can spend on your bike!!

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post #9 of 16 (permalink) Old 09-13-2016, 08:05 AM Thread Starter
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I like what I've read about Ivan's ecu flash except I have a hard time always finding 91 octane fuel. Most of the fuel around here is 87 only. I know that Kawi recommends always using 91 and I do every time I can, but not always an option on the road. My bike did not have this stumble for the first 20K miles or more, but at some point it began to do it enough that I now notice it. Currently have about 34K miles.
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post #10 of 16 (permalink) Old 09-13-2016, 08:10 AM
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stumbles like this are caused by closed throttle position then you open throttle and it stumbles, it's not by rpm's but rather by throttle position. I think what's happening is the motor stumbles from less fuel after throttle is completely closed then opened again, the fix might be to get the ecu to add more fuel in one of the pots, I don't know which pot is which on fuel injections but the motor does not care if its carb or fuel injected, a lean condition just off throttle is a lean condition so you're going to need a powercommander or whatever they are called and flash the pot to increase fuel for that throttle pot# position

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