Tank Slapper - Please enlighten me as to what it is.........

Steve - RS125 · Spanner Monkey Joined: 05 Mar 2006 Karma :

Now call me silly / stupid or whatever one chooses to call me, but what is a tank slapper?

Now I am guessing its when I have bounced ones crown jewels of the tank going over a bump, braking excessivley hard into a corner and have ended up talking like joe pescualy for the next 2 weeks?

Please enlighten me as to what it is.

Thanks.

P.s - 2 weeks to my DAS test and then a further 1 hour until my 600cc comes from under the dust sheets! Twisted Evil

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Suzuki VL Intruder 125cc - September 2004 to July 2005
Aprilia RS 125cc - July 2005 to Present
Suzuki RF600RR - May 2006 to October 2006 (RIP RF600)

veeeffarr · Super Spammer Joined: 22 Jul 2004 Karma :

Here's some info that took me about 5 seconds to find on a search engine!

coolfox1 · Scooby Slapper Joined: 14 Apr 2004 Karma :

Steve - RS125 · Spanner Monkey Joined: 05 Mar 2006 Karma :

Cheers folks!! Thumbs Up

Now I know what they are I can say its never happend to me as yet!

Once again, cheers. Thumbs Up

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Suzuki VL Intruder 125cc - September 2004 to July 2005
Aprilia RS 125cc - July 2005 to Present
Suzuki RF600RR - May 2006 to October 2006 (RIP RF600)

Dark · World Chat Champion Joined: 02 Jun 2004 Karma :

High speed tank slappers are really scary! my past experience with them shows that i just held on and hoped for the best, i didn't really have enough wits about me to do anything but.
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NSR Mick · World Chat Champion Joined: 26 Jun 2005 Karma :

If you get a proper tank slapper you will crash more often than not, a shake of the bars is'nt really a slapper.
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Dark · World Chat Champion Joined: 02 Jun 2004 Karma :

Vin · World Chat Champion Joined: 02 Aug 2005 Karma :

Dark · World Chat Champion Joined: 02 Jun 2004 Karma :

Indeed the rider on the Norton at the TT definitely looked liked a passenger to the scene of the accident to me. Suggesting that he fell off because he fought the slapper is proposterous!
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My Bikes in order:- Yamaha RXS100 / Suzuki X7 250 / Yamaha RD350LC / Kawasaki
KR1S 250 / Kawasaki ZXR750 H2 / Honda C50 / Kawasaki ZX7R P5 / Kawasaki ZX10R / Suzuki GSXR 400 / Honda CBR1100 Blackbird & Yamaha FZR 600

NSR Mick · World Chat Champion Joined: 26 Jun 2005 Karma :

He has mistaken a wobble as a tankslapper. Laughing

a tank slapper has the potential to break your thumbs as the bars will go from lock to lock.
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Slickfish · Crazy Courier Joined: 24 May 2005 Karma :

getyerkneedow... · Trackday Trickster Joined: 25 Aug 2004 Karma :

Dark · World Chat Champion Joined: 02 Jun 2004 Karma :

getyerkneedow... · Trackday Trickster Joined: 25 Aug 2004 Karma :

killa · Won't Shut Up Joined: 18 Oct 2004 Karma :

Having the bike set up wrong will give you some horrible tank slappers….

My TZR 125 (big bore) was mental, the bars were loose as anything and the suspension really needed looking at, not so much power slappers but it did wobble a lot.
The VFR is very hard to get a wobble with as the bike is setup almost perfectly, the Ninja however has scared me off a slip road to a motorway.
I must say though, in my experience you need to be really ragging a bike to get a wobble out of a corner, and if you get slappers from road surfaces, you should’ve known better.
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Dark · World Chat Champion Joined: 02 Jun 2004 Karma :

alec_h · Scooby Slapper Joined: 11 Feb 2006 Karma :

https://www.brucester.net/ftp/movies/tankslapper.wmv

That looks scary to say the least at full speed.

The guy with the yellow flag in the white coat thing was destined to get knocked down by the bike until the curb stopped the bike going in his direction lol

(apologies if the link doesnt work)
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Jack_Cheese · World Chat Champion Joined: 14 Jul 2005 Karma :

Kam · Crazy Courier Joined: 03 Sep 2005 Karma :

that site is REALLY good for other info :O found this section really helpful and interesting

https://www.joe250.com/motorcycles/ride/firstbike.htm
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lllN30lll · World Chat Champion Joined: 12 Jun 2005 Karma :

I made a thread a few weeks ago about my encounter

168mph and bike went into a tank slapper after hitting drainage lines.

gave me serious bruising in my arms from trying my best to stop it, lasted around 15 seconds.

worst thing thats ever happened to me in 12 years of riding Sad

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TheShaggyDA · Repost Police Joined: 14 Jun 2004 Karma :

GearboxGeezer · World Chat Champion Joined: 06 Sep 2005 Karma :

Is it possible to get a majour tank slapper on a rs 125, I saw a rs 125 due to the fact that they rarely reach speeds of 100 mph..

Also is there a main cause of a tank slapper? or is it just a thing that somtimes happens when your riding to fast.

V2 · Nearly there... Joined: 06 Feb 2006 Karma :

i thought it was when you pick up lady's of the night with a single seat hump on the bike.... nowhere else for them to sit, hey presto... one tankslapper. (sorry)

Jack_Cheese · World Chat Champion Joined: 14 Jul 2005 Karma :

It can happen to an RS and at 100mph, you're f*cked if you get one on an rs125 because you can't power out of it.

It happens because the front tyre hits something and becomes destabilised to one side, and it starts going left to right and back again. If you brake, more weight gets loaded onto the front and it'll normally get worse. I haven't had one, and to be honest the thought of having one at 95mph on a 125 puts me off using the full potential of my bike.

I think i'm just worried because the mito comes with a damper, but my planet doesn't...

Jack
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Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Tank slapper is normally where the forks whack between the lock stops at the natural resonant frequency, so it keeps doing it. Quite capable of throwing you off the bike and very different from a bit of a wobble of a quick slap lock to lock.

No reason that something with the performance of an RS125 wouldn't manage a tank slapper. KH250 (late 70s design of 2 stroke 250) would be about the same performance and they would happily go into a tank slapper.

Normal recommended way out of it is to accelerate out of it. Braking would have much the same effect (in that if would affect the resonance), except that it would transfer weight onto the rather wayward front. Not what you really want to do.

All the best

Keith
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