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Author Topic: Stutter at a specific throttle position.  (Read 4513 times)

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adkg12

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Stutter at a specific throttle position.
« on: May 20, 2015, 03:45:56 PM »
I know I am bugging the hell out of you guys, but I AM weeding out the messes!  So, I have this little stutter when I hold the throttle in a specific position.  Dont laugh, but its like "daaaaa.da.dadaaaaaaaaaaaa.da.daaaaaa"  LOL.  At first I thought maybe it was the Fuelpak and just a bad mode but I unplugged to FP and went with just the ECM and its there too.  Its really early in the throttle twist.  I removed the A/C and cleaned that all out with seafoam spray (it was a little cruddy) but it is still doing it.  Any ideas?
Thanks
Glen
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Re: Stutter at a specific throttle position.
« Reply #1 on: May 20, 2015, 06:11:16 PM »
Dead lean , its dropping one cylinder . Try changing the codes in the one size fits all tuner  ha ha
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adkg12

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Re: Stutter at a specific throttle position.
« Reply #2 on: May 20, 2015, 06:24:18 PM »
Believe it or not,I might have figured it out.  The little cap on the end of the spark plug was horribly loose.  Almost off actually.  I removed the plugs to examine them.  Probably need replaced anyway.  But I tightened it and reinstalled, after cleaning them of course and so far it's not doing it.  Btw, both plugs were a medium to light brown.  In my carburetor days I would I considered that to be ok if not a tiny bit rich.  So I dunno...
Glen
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Re: Stutter at a specific throttle position.
« Reply #3 on: May 21, 2015, 09:03:58 AM »
so it was dropping one cylinder , spark plug though..   Reading a plug with todays pump gas is very hard and can be mis leading.
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adkg12

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Re: Stutter at a specific throttle position.
« Reply #4 on: May 21, 2015, 09:08:25 AM »
Yep.  I rode in this morning to work, not one stutter.  Yea as for reading the plug, it was more of an observation.  Side note, I have an appointment with a dyno next week.  I'm curious.  V&H said that if I can get dyno results, they can build me a more accurate map.  Lol.  It's only 45.00 and I figured other than the 45.00, what do I have to lose lol?!  I have started my wish fund...hopefully before the season is over, I'll have a real tuner lol..
Glen
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Re: Stutter at a specific throttle position.
« Reply #5 on: May 21, 2015, 09:12:52 AM »
How can they do that ?? you show them a WOT run and they then sell you a new fuel curve for that pull??? The WOT area is where you spend the least amount of time riding. Those tuners are a patch style map ( large section changes) Save your money would be my suggestion. Install the proper tuner when you can.
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adkg12

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Re: Stutter at a specific throttle position.
« Reply #6 on: May 21, 2015, 09:17:34 AM »
As V&H explained, if I give them the a/f ratios throughout the fuel circuit (measured at specific speeds and throttle positions), he can compare it to the numbers I currently have in the modes, and make a more accurate and educated map.  I am no expert, but I figured it would be interesting to see the a/f, torque and HP that I am currently producing..no?
Glen
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Re: Stutter at a specific throttle position.
« Reply #7 on: May 21, 2015, 09:25:51 AM »
Well being  you have a tuner that will change fuel on front and rear the same.. Any way you cut it is a crap shoot. They may be able to change things  your money.. Good luck  :2vrolijk_21:
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adkg12

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Re: Stutter at a specific throttle position.
« Reply #8 on: May 21, 2015, 09:46:24 AM »
LOL good point...LOL btw here are the plugs.. just for giggles.

https://drive.google.com/file/d/0B8T43yISGSdnaUpKQkNsZDFkc2M/view?usp=sharing

https://drive.google.com/file/d/0B8T43yISGSdncDRwVnA4UnNqNFE/view?usp=sharing

I am thinking the electrodes look a bit burned down?  LOL. 
Glen
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Re: Stutter at a specific throttle position.
« Reply #9 on: May 21, 2015, 09:50:15 AM »
are you running a octane booster?? that is not a good looking plug.. looks like you left them in a bucket of water ..
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adkg12

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Re: Stutter at a specific throttle position.
« Reply #10 on: May 21, 2015, 09:52:29 AM »
I WAS running an octane booster due to the 89 octane, but I am no longer.  What do you see on that plug that concerns you the most...
Glen
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Re: Stutter at a specific throttle position.
« Reply #11 on: May 21, 2015, 10:00:39 AM »
well your finger nails are way to clean .. ha ha  the octane booster coats the plugs so what you see there is nothing really. Just booster. I would suggest a set of new plugs gap to .035 and then ride the bike. If your tune is off running a step colder plug may be of some help for you as well.
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adkg12

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Re: Stutter at a specific throttle position.
« Reply #12 on: May 21, 2015, 10:13:12 AM »
I see...LOL..  The current plug is the autolite 4164.  I am not really sure what plug to run other than the same plug thats in there.  I do occasionally get a cough right after changing from 1st to 2nd and applying throttle after the clutch release.. a hesitation..but the stutter is gone.  This bike actually had an autotuner on it when I got it, cant recall the name, but it failed due to water getting into it.  The unit had connections to my O2 sensors, as well as my TPS...and if I am not mistaken, the ECU.  Cant recall the name though.
Glen
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Re: Stutter at a specific throttle position.
« Reply #13 on: May 21, 2015, 11:14:04 AM »
While the autolite is a common plug I have found the direct part number swap from stock to work . However I have seen a leaner afr running the Autolite vs Champion ..  I was testing some plugs and saw that based on a stock 103 build direct plug for plug.

I would suggest one step colder plug NGK being that you have a so so tuner. It will not hurt the set up. and those plugs are junk now.
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adkg12

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Re: Stutter at a specific throttle position.
« Reply #14 on: May 21, 2015, 11:16:02 AM »
Yea I agree they aren't in the best of shape.  Wouldn't happen to have that part number would ya? Lol
Goff
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