Subtle Tank Slapper at high speeds under acceleration - Suzuki GSX-R Motorcycle Forums Gixxer.com
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post #1 of 12 (permalink) Old 08-02-2019, 07:01 PM Thread Starter
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Subtle Tank Slapper at high speeds under acceleration

I recently got my fork seals redone & had them put a new front tire on while they had the front wheel off. I ordered the tire from revzilla, matching the stock tire size as both wheels are stock. Both front & back tires are the same make & model.

The steering at low speeds feels much easier/looser. I assumed maybe they re-lubed the steering column or whatever it's called on a bike. Overall, the bike feels much better cornering & absorbing bumps.

The negative is that when I get on it on the highway & reach triple digits, the front goes into a slight tank slapper. Letting off the throttle stops it immediately. The front end does not come up during acceleration, so I don't see how the front end is getting out of line with the rear. I know we have the stock steering damper...could they have changed the settings of this? What other things could be causing this?

Any insights would be greatly appreciated.

Thanks

Goat
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post #2 of 12 (permalink) Old 08-03-2019, 01:36 PM
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Re: Subtle Tank Slapper at high speeds under acceleration

Damping settings, improper balance, incorrect fork height, bad tire, etc.
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post #3 of 12 (permalink) Old 08-04-2019, 06:39 AM Thread Starter
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Re: Subtle Tank Slapper at high speeds under acceleration

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Originally Posted by TheGeek View Post
Damping settings, improper balance, incorrect fork height, bad tire, etc.
EDIT: After some research it looks like my Steering Head Bearings could be loose. Too loose results in exactly what I'm experiencing. I'm going to check & see if they're loose.

I can do some research on adjusting damper settings

Improper balance - I assume you mean the wheel? I had the mount & balance done by a very reputable shop I doubt they would mess that up - but you never know.

Fork height - It seems to be the same height prior to reseal, but I did not measure

Bad Tire - It's a Shinko so a cheaper tire although the rear is the same & has been excellent.

Last edited by 6oa7; 08-04-2019 at 08:11 AM.
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post #4 of 12 (permalink) Old 08-04-2019, 08:25 AM
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Re: Subtle Tank Slapper at high speeds under acceleration

The shop didn't need to take any of the the steering loose to do the service you described.
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post #5 of 12 (permalink) Old 08-04-2019, 12:35 PM
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Re: Subtle Tank Slapper at high speeds under acceleration

I gather that yours doesn't have an electronic damper. It might have picked up some air that could affect its functioning. Check for that.

The shop had the forks off, which is too close to the steering head for comfort. Check for loose bearings. They might have been loose before the work and you didn't notice. I'm most suspicious of it.

It's rarely a problem on narrow motorcycle tires but the weights should be staggered on opposite sides of the wheel if more than one is used.

Bad tires show up on reputable brand car tires so there's no reason that it can't happen on yours.

Also check that the various triple clamp and axle bolts are properly tightened.
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post #6 of 12 (permalink) Old 08-04-2019, 01:11 PM
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Re: Subtle Tank Slapper at high speeds under acceleration

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Originally Posted by 6oa7 View Post

The negative is that when I get on it on the highway & reach triple digits, the front goes into a slight tank slapper.
There's no such thing as a slight tank slapper. If it was a full on tank slapper, slight would be the last word you'd use to describe it. I think the term you're looking for is speed wobble. Either that or you have the world's biggest balls lol...
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post #7 of 12 (permalink) Old 08-04-2019, 02:35 PM
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Re: Subtle Tank Slapper at high speeds under acceleration

I question why you're doing triple digit speeds on a highway/local road way...
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post #8 of 12 (permalink) Old 08-05-2019, 03:42 AM
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Re: Subtle Tank Slapper at high speeds under acceleration

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Originally Posted by Meeps View Post
I question why you're doing triple digit speeds on a highway/local road way...
Have you never done that?
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post #9 of 12 (permalink) Old 08-05-2019, 09:36 AM
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Re: Subtle Tank Slapper at high speeds under acceleration

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Originally Posted by closetotheedge View Post
Have you never done that?
Actually no I havenít. Because the ticket in Florida if mailed is too costly and is a mandatory court appearance. They evaluate possibly taking of your license (motorcycle and automobile).

Iíve taken my bike and car to triple digit speeds before but on a drag strip only
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post #10 of 12 (permalink) Old 08-05-2019, 12:24 PM
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Re: Subtle Tank Slapper at high speeds under acceleration

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They evaluate possibly taking of your license (motorcycle and automobile).
They wouldn't do that. All they care about is getting your money. They don't actually care about you. The main reason for speed limits isn't safety, hence why so many don't stop.
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post #11 of 12 (permalink) Old 08-05-2019, 02:52 PM
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Re: Subtle Tank Slapper at high speeds under acceleration

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Originally Posted by Jacob54s View Post
They wouldn't do that. All they care about is getting your money. They don't actually care about you. The main reason for speed limits isn't safety, hence why so many don't stop.
Actually in the State of Florid they really don't give a shit. They will take a license for any number of reasons. I've actually had friends lose their license for lane splitting just saving their ass because of a motorist behind them not slowing down at stopped traffic or a traffic control device when an officer is present. I've even been pulled over for the same reason, but the officer more times than not lets it go when they see what's happening but they still pull you over for a warning and why you shouldn't do it. But state of florida will take a way a license with out a care in the world or with out a single bat of the eye.
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post #12 of 12 (permalink) Old 08-06-2019, 03:23 AM
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Re: Subtle Tank Slapper at high speeds under acceleration

+1^
Was stationed in FL for a number of years, and they will indeed mess with you for no good reason.
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