GixxerJohn
Zone Head
2012 zx14R SE
Posts: 537
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posted May 08, 2012 07:31 AM
Same thing here,went down one tooth and if cruising around a parking lot it wants to buck you off it.
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2012 ZX14R SE
  
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kaw-rick
Pro
Posts: 1167
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posted May 08, 2012 12:00 PM
16/44 here no problems.
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Greggy
Expert Class
Posts: 150
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posted May 08, 2012 06:39 PM
quote:
Same thing here,went down one tooth and if cruising around a parking lot it wants to buck you off it.
Yep that's a good way to describe what happens.
Going around slow corners at a constant pace was also difficult with the 16T front sprocket installed, as it would jerk as the power was going on and off. It was enough of a concern for me that if the roads were wet I'd say it would be (almost) dangerous!
Greggy
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2012 ZX-14R ABS - Spark Black - Two Brothers V.A.L.E. Carbon slip ons P1X tips - Powerbronze DB screen.
1990 ZX-10 Ninja - Megacycle stainless steel mufflers - gear-sack rack - tinted screen.
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smokinZX14
Needs a life
Posts: 10197
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posted May 08, 2012 07:02 PM
I wonder if maybe me running a 16 tooth and a 43 rear might even things out .. But i ran just a 16 tooth for a while and had no problems either .. For a short time i had 17/41 and 40 gears on the bike and zero problems .. One would think as many gear changes i have done on this bike i would have felt something wrong if there was a problem ..
Question for you guys having the problem .. Are your flies out or in .. Mine are out and like a said before this bike could not be any smoother in any gear or RPM .... Maybe flies out fixes this problem ?
Changing gear doesn't do anything to the TC , it works the same no matter what gear is on the bike because wheel speeds stay the same .. Only thing i can think of is the wheel sensors are working fine but the engine sees different RPMs after a gear change .. It's possible that the RPM signal doesn't match what the wheel sensors are seeing .. The two maybe tied together in some way .. Again i don't have this problem with mine or i'm not seeing a problem the way i ride my bike .. If this is a RPM and wheel sensors not working together a fix something like a speedo healer that would readjust RPM reading and not the speedo might fix the problem ..
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Smokin Performance Cycles..
Tampa Bay , FL .. Brocks Performance Dealer ..
Gen 2 ZX14R Best ET 8.43 , Best MPH 164.95
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Greggy
Expert Class
Posts: 150
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posted May 08, 2012 07:30 PM
Hey smokin - my flies are in (stock) so perhaps they have something to do with it. We need more people to test with and without.
Greggy
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2012 ZX-14R ABS - Spark Black - Two Brothers V.A.L.E. Carbon slip ons P1X tips - Powerbronze DB screen.
1990 ZX-10 Ninja - Megacycle stainless steel mufflers - gear-sack rack - tinted screen.
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kaw-rick
Pro
Posts: 1167
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posted May 09, 2012 03:13 AM
flies still in. 16-44 no problem
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smokinZX14
Needs a life
Posts: 10197
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posted May 09, 2012 05:35 AM
quote:
flies still in. 16-44 no problem
Well there you go ...Flies in and flies out and no problems ...That makes me think it's just some bikes with a problem or it's just the riding style of some owners that see the problem ..Not that they are riding badly or wrong but they are just riding differently making this problem show up..
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Smokin Performance Cycles..
Tampa Bay , FL .. Brocks Performance Dealer ..
Gen 2 ZX14R Best ET 8.43 , Best MPH 164.95
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GixxerJohn
Zone Head
2012 zx14R SE
Posts: 537
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posted May 09, 2012 05:53 AM
Its not riding different thats the problem, take your bike in first gear and just roll around a parking lot barley giving it gas as like being in traffic. It will buck bad. But once u give it a lil gas it clears right up. If i start out normal cruising it doesnt do it ever, its just if you get stuck in a parking lot situation and stuck behind a car going like 10 mph. Then forget about its like being on a bull. Its not brocks problem its the dam gearing.
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2012 ZX14R SE
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Bently
Needs a life
2012 14r In Blue and no Mods!
Posts: 5428
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posted May 09, 2012 06:18 AM
quote:
Its not riding different thats the problem, take your bike in first gear and just roll around a parking lot barley giving it gas as like being in traffic. It will buck bad. But once u give it a lil gas it clears right up. If i start out normal cruising it doesnt do it ever, its just if you get stuck in a parking lot situation and stuck behind a car going like 10 mph. Then forget about its like being on a bull. Its not brocks problem its the dam gearing.
after reading this i don't really think you have a problem at all. any bike I've ever had will do that at that speed with the clutch lever fully out. you need to work the clutch lever at those speeds. 10 mph or lower with clutch fully out is very low rpm
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dakota9498
Pro
Posts: 1181
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posted May 09, 2012 06:23 AM
+1 Bently. Something else to take into consideration, It may have something to do with the slipper clutch making it worse on this bike as well. Who knows.
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2008 ZX14
Never argue with a fool, onlookers may not be able to tell the difference. ~Mark Twain
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GixxerJohn
Zone Head
2012 zx14R SE
Posts: 537
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posted May 09, 2012 06:53 AM
I hear u bently i do,but im tellin you this is not rider error. I have been riding since 6when on my lil xr80,i have had 11 street bikes now including the 09bike zx14. And they NEVER DID THIS. And my proof is along with other people is in stock gearing i tried it and it goes away complety, go back to 16stock bam its right back. I hear what your saying about the clutch but im not a newbie rider, but i understand what you mean about tbe clutch. Its like if u slow down in a hurry and u dont downshift the clutch will buck like crazy from being in to high of a gear. ITS NOT THAT.TRUST ME
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2012 ZX14R SE
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Adams Performance
Parking Attendant
Big Bore Long Stroke
Posts: 19
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posted May 11, 2012 04:00 AM
completely stock one today 4 miles, the "bucking" is not as noticeable, with a 44 tooth sprocket on it, but does have it. The other bike has flies out and is extreme when it does it. At low speeds like they are saying below 3500 rpm. It isn't rider error, it is the bike, that is doing it. I haven't had a chance to change different gearing on the bikes yet but im hoping to figure out something. I would almost bet they all do it, some are just more noticeable than others, and im not understand why some some are like riding a bull and other are not.
Garron
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Coby Adams
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blue07
Expert Class
Posts: 485
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posted May 11, 2012 08:38 AM
 Edited By: blue07 on 11 May 2012 16:43
Okay...I had this issue as well.....not in the stock configuration...(it may have been there,but I didn't feel it for whatever reason)...but with a freer flowing exhaust and mapping...it was there...bad.The mapping on the bottom was teaked by an expert...the problem disappeared.Fueling...mapping...that's what's causing this.Not gearing or ECU confusion.(although...I guess it COULD somehow mess with the ECU program?)
I hear ya on 'some are doing this and others no problem"....I would guess...that some guys are taking off differently than others.Naturally.But at certain throttle openings(at minimal speeds....barely rolling and such)...it IS there.Like I said though...mine was 'mapped out' from doing it.Nothing else was changed.Only the mapping.I still ride the same...it is not there now.Chain slack is adjusted correctly.Idle is perfectly smooth.Ktrc in '1'...power...'F'.91 octane.
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smokinZX14
Needs a life
Posts: 10197
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posted May 11, 2012 08:06 PM
quote:
completely stock one today 4 miles, the "bucking" is not as noticeable, with a 44 tooth sprocket on it, but does have it. The other bike has flies out and is extreme when it does it. At low speeds like they are saying below 3500 rpm. It isn't rider error, it is the bike, that is doing it. I haven't had a chance to change different gearing on the bikes yet but im hoping to figure out something. I would almost bet they all do it, some are just more noticeable than others, and im not understand why some some are like riding a bull and other are not.
Garron
Garron i didn't say rider error , i said different riding styles ..I'm not blaming the rider or saying they are bad riders ...I'm sure the way i ride is 100% different than most riders .. 
Try as i might , like trying things like riding the bike below 2000 RPMs i can't get the bike to do anything stange .. I wish i could , then maybe i could come up with a fix or an answer ..
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Smokin Performance Cycles..
Tampa Bay , FL .. Brocks Performance Dealer ..
Gen 2 ZX14R Best ET 8.43 , Best MPH 164.95
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GixxerJohn
Zone Head
2012 zx14R SE
Posts: 537
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posted May 12, 2012 04:36 AM
WOW smokin doesn't have an answer for once???
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2012 ZX14R SE
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Wheelie
Needs a life
Old Man
Posts: 6902
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posted May 12, 2012 04:55 AM
quote:
WOW smokin doesn't have an answer for once???
Fish ban gixxerjohn.
wee
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GixxerJohn
Zone Head
2012 zx14R SE
Posts: 537
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posted May 12, 2012 05:57 AM
Bite me old man!!!! I'll just keep coming back.
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2012 ZX14R SE
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MotoCycho
Expert Class
Posts: 337
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posted October 08, 2013 02:25 PM
Edited By: MotoCycho on 8 Oct 2013 22:30
I know this is an old thread but there was never a definitive cause and solution presented past the gearing change as the root cause, so I'd like to bring it up again and tell a little of what I have discovered and hope some one has solved the issue or can point me in the right direction.
I recently swapped the rear sprocket to a 43 on my 2013 14r. I also installed my re-flashed ECU at the same time. Drag flash via Brock's/Guhl. When I took it for the first ride I discovered that it would jerk and surge to varying degrees at different RPMs. Least noticeable, taking off from an engine idle as you feed in just a little throttle in first gear. Then shifting to 2nd gear soon not so low you lug the engine but as if you were in a neighborhood or in traffic.. with RPMs dropping to around 3200 or so for a pull thru 2nd.. at 4000 RPM with only the smallest TP%, say 2-5% the engine will surge and jerk, almost like a misfire or shudder. Then above 4200 or so it smoothed right out again and then at about 4800 - 5100 it would do the same thing. I initially thought this was the fuel mapping since the ECU re-flash opens the files sooner, and was causing a lean misfire or something fuel related. Having forgotten all about this issue and this thread, I proceeded to make countless fuel adjustments over the last few days and even tho the problem has gotten better at times it can happen at any time the TP and RPMs are just "right", the worst for me is in 2nd gear at the 4000 mark.
Yesterday I vaguely remembered there was an issue some had had with sprocket changes and I found this thread again. Turns out I had posted in this thread before, and long before I had my 14r, that it sounded like an issue I have had seen with the TPS being out of adjustment, and when this started to happen to me on my 14r I was immediately reminded of this issue, the difference being, that when the TPS is out of adjustment it shows when you try to hold a steady cruise speed and it was more prevalent in higher gears where the RPMs were very low and the throttle was just barely cracked open at tenths of a %, no more than 2%. As soon as you were accelerating at all it would go away. This bucking was happening during acceleration.. very light and slow acceleration, but accelerating nonetheless. It will not happen at all if you get on it with 10% or more throttle and take off with some authority.. which is great when you can do it.. but isn't possible from a stopped start at a school crossing for example.
I swapped the rear sprocket today back to the stock 42.. immediately problem is gone. I can confirm what others have proposed, that changing gears, at least the rear by 1 tooth larger for me, causes this issue.
I was wondering if anyone has figured out what is actually happening and solved, or found a work around, for the issue?
Sorry for the long post but with technical issues details matter.
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carabuser
Novice Class
Posts: 86
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posted October 08, 2013 06:10 PM
If you go up one in the rear, go down one in the front, the one from the zephyr is what people say to use, that should solve the problem, I don't know if anyone knows, why it happens ...
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