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Old 04-21-2010, 10:48 AM   #1 (permalink)
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Default 07 ZX6R , stutter at 4000 rpm , any one have this prob?

Hello,

I have a 07 ZX6R, with around 7000 miles.
Mods are akropovic slip on , k&n filter, power commander, jumper mod.

I currently have the bike at a local shop that dyno tunes motorcycles.

The problem is that we are discovering a stumble/stutter at 4000 rpm - 4500 rpm then it goes away.
As you accelerate through the spot it does'nt occur, it only shows up when you decelerate through the spot then come back to 4000rpm.
On the wide band, it goes completely lean between 4000 - 4500 then comes right back were it should be.

The guy that is tuning the bike for me also has a customer with the same bike as mine that is experiancing the excact same thing.

Guess my question is..........Is this an inherant thing with the 07 ZX6R? , or is there anyone that has came up with an fix for this?

The guy that is tuning this for me, said that he was going to try and adjust the throttle position sensor and hope that it solves this prob? Will this work?

Thanks for any helpful info,
Mike
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Old 04-21-2010, 11:00 AM   #2 (permalink)
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Mine does it also, not just at that rpm but at any where it is neither under load or decelerating. It just sounds flat untill you get back on the gas. It may be TPS related, I just live with it.

It happens at lower rpms not above say 6000
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Old 04-22-2010, 09:35 AM   #3 (permalink)
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Quote:
Originally Posted by 68GTS View Post
Mine does it also, not just at that rpm but at any where it is neither under load or decelerating. It just sounds flat untill you get back on the gas. It may be TPS related, I just live with it.

It happens at lower rpms not above say 6000
Well, I really was wanting to find a fix for this due to the fact that were the stutter is in the rpm range is around 30mph.
It makes it difficult to ride the bike in slow stop and go traffic.
Plus, it annoys the hell outa me......
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Old 04-22-2010, 07:58 PM   #4 (permalink)
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change your plugs. my bike is highly modded and everytime it stutters at around 5,500 i know its time to change the plugs. And my bike has no problem accelerating through it, it just sounds like a dirt bike or its running on 2 or 3 cylinders. As soon as the rpm gets up it runns stronger then stock.

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Old 04-23-2010, 12:24 AM   #5 (permalink)
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I have the exact same problem on my bike, my mods are arata full ti exhaust and a pcIII. I've been emailing a tune back and forth with one of the dynojet guys and it seems to be getting better, but I know exactly what you're talking about and it drives me nuts. I ride every day, so the fact that is does it around 30mph sucks because I'm always in some sort of stop and go situation. Whenever I'm in 1st gear or 2nd gear around 3900rpm to 4500rpm it stumbles and if I'm rolling off the throttle it decelerates pretty quick. I also notice it whenever I downshift and flick the throttle it burbles a little like it does at 30mph. I've heard of people messing with the TPS, I just wasn't sure what exactly they are manipulating on the sensor. Anyone else adjusted the TPS and had it positively affect this situation?? Just like the OP, I would like to just fix this problem.
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Old 04-23-2010, 10:53 AM   #6 (permalink)
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Picked bike up last night from tuner.
He totally fixed the stutter, and improved roll on power.
Dynoed at 108.9
The red line is before the jumper mod and the blue line is after, pretty impressive for just a wire...lol

Thanks to Chris Hill at Performance Psycle in Knoxville, TN
He actually spent a good amount of time to smooth this bike out

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Old 04-23-2010, 01:42 PM   #7 (permalink)
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Any idea on what the tuner fixed on the bike to get it to not stutter at all?? I've only had this bike for 2 months and have lived with it, but I know it shouldn't be like this as my last carbed bike was way smoother even in low rpms. Any help is greatly appreciated.
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Old 04-23-2010, 02:02 PM   #8 (permalink)
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Quote:
Originally Posted by 02-ZX6R View Post
Any idea on what the tuner fixed on the bike to get it to not stutter at all?? I've only had this bike for 2 months and have lived with it, but I know it shouldn't be like this as my last carbed bike was way smoother even in low rpms. Any help is greatly appreciated.
What he told me, was that he adjusted the throttle position sensor alittle on the upper scale of the voltage readings and then worked the rest out on the dyno tune.

Hope that helps
Mike
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Old 04-24-2010, 11:19 AM   #9 (permalink)
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Thanks, I'm gonna try and fiddle with the TPS and see if that helps. Glad you got your issues sorted out, I would eventually like to find someone near me to do a dyno tune on it.
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Old 09-06-2010, 11:43 PM   #10 (permalink)
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so the only way u no your tps is out of whack is testing it with a meter, cuz i jump on mine and it bogs bad, and basically have to roll slow to get on it even then that sucks
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