Violent surging on closed throttle 2005 ZX6R - ZX6R Forum
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post #1 of 22 Old 05-09-2013, 07:02 AM Thread Starter
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Question Violent surging on closed throttle 2005 ZX6R

If I close the throttle at high rpm in first gear the bike does not decelerate smoothly but changes between decelerating and surging rapidly and quite violently. It behaves itself in any other gear. I've had mechanics look at it and they say the throttle position sensor,vacuum hoses, injectors, fuel pump, exhaust valve and throttle body balance are all OK. I've had another throttle body with sub throttle actuator fitted with no change in symptoms. The slipper clutch is not the problem. We have run out of ideas. Has anyone out there had this problem?
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post #2 of 22 Old 05-09-2013, 07:19 AM
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Does it feel like it's actually trying to go/rev or does it feel like maybe its popping out of gear and back in making it buck and feel like it isn't decel'ing and then is again?
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post #3 of 22 Old 05-09-2013, 07:21 AM
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Does it feel like it's actually trying to go/rev or does it feel like maybe its popping out of gear and back in making it buck and feel like it isn't decel'ing and then is again?
That's what I was thinking. Could a worn shift fork cause that to happen only in 1st? Sounds like it could be the issue.

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post #4 of 22 Old 05-09-2013, 07:46 AM
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1st gear would have the most pressure on it when decelerating.
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post #5 of 22 Old 05-10-2013, 01:06 AM Thread Starter
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If I close the throttle at 8000 rpm in first the bike decelerates normally to 6500 then does a brief reasonably gentle surge then decelerates again followed by another brief surge. I can't believe the shift forks are changing gears because there is load on the gearbox and you can't change gears smoothly with load on the box. There is no crunching from the box at all. Whether it's getting a brief burst of power or the deceleration force is briefly interrupted I'm not sure.

If I close the throttle at 12000 rpm it goes nuts, decelerating and surging at the rate of about twice a second. Once again no noise from the gearbox and it's always still in first gear when I declutch or accelerate. If I do accelerate from that situation it behaves perfectly and will loft the front wheel. If I close the throttle in any other gear at any rpm it decelerates smoothly.

Once again I'm sure it's not the slipper clutch, it's got new torque, and clutch springs, the plates are good and there is no slipping on maximum acceleration. If it was, surely when I shut down in second gear at 130 kph there would be as much back torque as shutting down in first at 8000 rpm and the problem would appear again.
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post #6 of 22 Old 05-10-2013, 01:13 AM
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You shouldn't be closing the throttle in first at 12k

Shift to second, then close throttle
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post #7 of 22 Old 05-10-2013, 07:07 AM Thread Starter
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Yes I know one wouldn't do that normally but to do a wheelie I accelerate to 10000, close the throttle to compress the fork springs and then open the throttle fully on the rebound which lofts the front wheel beautifully. It's only started this surging recently. Never had the problem before.
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post #8 of 22 Old 05-10-2013, 11:28 AM
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You shouldn't be closing the throttle in first at 12k

Shift to second, then close throttle
This. Its a high compression motor, so how do you expect it to behave when you just snap shut the throttle in first gear at high RPM??

Maybe stop worrying about pointless stuff like wheelies and work on proper riding technique.
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post #9 of 22 Old 05-10-2013, 11:36 AM
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This. Its a high compression motor, so how do you expect it to behave when you just snap shut the throttle in first gear at high RPM??

Maybe stop worrying about pointless stuff like wheelies and work on proper riding technique.
I think anyone would expect it to behave normally not like described. Also it may be poinless to you about wheelies but he didn't ask for your opinion... how would you know how proper he rides his bike? Get off his ass for wheelies. Plenty of people can wheelie and I'm sure have better technique than you.

My bike doesn't act the way his does. Hope someone else can help you out instead of pointless posting.

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post #10 of 22 Old 05-10-2013, 12:07 PM
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I think anyone would expect it to behave normally not like described. Also it may be poinless to you about wheelies but he didn't ask for your opinion... how would you know how proper he rides his bike? Get off his ass for wheelies. Plenty of people can wheelie and I'm sure have better technique than you.

My bike doesn't act the way his does. Hope someone else can help you out instead of pointless posting.
Dont agree. When you are around 10-12K RPM's and just let off the throttle, of course the bike is gonna abruptly stop. This will be exaggerated in 1st gear.

I dont condone wheelies or other stunts, and if I did, I wouldnt use his method to do it. There is a thing called clutching up..been around for a long time.
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post #11 of 22 Old 05-10-2013, 01:56 PM
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I'm trying to understand what he means be decel and the surging. I understand totally that the engine breaking in first is rough but he talks like it does two different things when he lefts off. And your probably right that its just the engine breaking from letting off and nothing is wrong.
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[[11' zx6r green & black]]
| X-tre || 35w 6000k hid || K&N air filter ||
|| Shortly levers || -1/+2 superlite || Speedohealer ||
|| ohlins damper reworked to race spec || PCV ||
|| woodcraft framesliders|| Annitori RL QuickShifter||
||M4 GP slip on|| Driven block off plates|| tech tank grips||
||Puig racing windshield|| rear cowl|| stomp grips||
||RSC easy pull clutch lever||
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post #12 of 22 Old 05-10-2013, 02:57 PM
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Do you have a powercommander or anything like that? Overly rich maybe doing something? shit idk haha.
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post #13 of 22 Old 05-10-2013, 03:35 PM
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It kind of sounds as if your engine was shutting off and then immediately restarting. As if the ECU was turning fuel injection off and on... Does the engine braking feel harder than usual during decelerating?

Does this thing happen in other gears if you close the throttle and brake at the same time?
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post #14 of 22 Old 05-10-2013, 04:01 PM
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Now guys this is an 05 he has. Does it do this after it reaches temp. Like said above could be ecu somewhat fried the 05 had this problem because of where it was mounted they changed it in 06.
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post #15 of 22 Old 05-10-2013, 05:49 PM
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Where was the difference of the ECU position between the 05 and 06? Im just curious...
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