FasterThanStink
Pro
Posts: 1218
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posted September 05, 2008 05:07 PM
Acceleration Knock
I have been noticing an obvious knock on had acceleration lately. I burn 92 octane fuel but what else could be causing this? It is not subtle, it is a real knock when twisting the go stick.
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Speed has never killed anyone,
suddenly becoming stationary...
That's what gets you.
   
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smokinzx14
Needs a life
Posts: 10197
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posted September 05, 2008 05:18 PM
Is this knock sound at low RPMs or High RPMs .. Under heavy load or light load? Can't you hear it sitting still by blipping the throttle ? Can you hear it with your helmet off or just when you have your helmet on?
I have seen gas stations mess up before and got 87 when it was labled 92 .. Might want to try some gas from another station and see what happens ...Sometime the 92 get goes bad because it set so long in the tanks ...Not many people buy 92 these days ..
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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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zx6reaker
Expert Class
D&D's, Frame sliders, pcIII
Posts: 147
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posted September 05, 2008 07:02 PM
Good question. Mine does this as well. I can hear it just blipping the throttle from idle. I don't ever get on it hard from idle when I'm riding so I don't know if it does it then.
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Loud pipes and bright lights save lives.
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neverknow
Novice Class
Posts: 79
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posted September 05, 2008 09:15 PM
Sure it is a motor knock and not the clutch or tip sensor?
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zx6reaker
Expert Class
D&D's, Frame sliders, pcIII
Posts: 147
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posted September 06, 2008 06:57 AM
I'm pretty sure. It almost sounds like piston slap more than vavles. It's a knock not a tap.
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Loud pipes and bright lights save lives.
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FasterThanStink
Pro
Posts: 1218
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posted September 06, 2008 08:46 AM
It knocks under load under moderate to heavy throttle. It is quite noticeable.
____________
Speed has never killed anyone,
suddenly becoming stationary...
That's what gets you.
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smokinzx14
Needs a life
Posts: 10197
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posted September 06, 2008 09:36 AM
quote:
It knocks under load under moderate to heavy throttle. It is quite noticeable.
Mine has had a knock since i got it new ... You can hear it on light accell from about 1500 to 3000 after that you can't hear it .. I hear it better with my helmet on for some reason .. I hear it best at low speeds driving around town .... Doesn't seem to be a problem after 800 1/4 mile passes and 3500 street miles ..I have heard more than a few zx14 with the same knocking sound and none of the have ever had a problem .... I'm not sure that is your knocking sound because i haven't heard yours but it soulds like it might be the same as mine ..
Smokin..
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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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FasterThanStink
Pro
Posts: 1218
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posted September 07, 2008 07:03 AM
It's probably the same. My first one did not knock at all so I just wondered what was up. The gas here all has that ethanol crap in it. You used to be able to but "non Oxygenated" (no ethanol) fuel at some stations but that is not the case anymore.
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Speed has never killed anyone,
suddenly becoming stationary...
That's what gets you.
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CrotchRocket
Moderator
Bracket Racing with Betsy
Posts: 8038
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posted September 07, 2008 07:31 AM
 Edited By: CrotchRocket on 7 Sep 2008 08:33
Every motor does that including cars...I have been told that's not good for the motor, just keep the R's up above the motor lugging...
Depending on your gearing, that will happen at a lower or higher RPM...
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Jason Miller StreetBike Seminars
*****DragRacers do it better, because they dont cut Corners*****
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