Tank Slap Question - MVAgusta.net
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post #1 of 13 (permalink) Old 12-09-2007, 03:43 PM Thread Starter
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Tank Slap Question

Is tank slap caused by temperature?

The other night, I left the Brutale outside over night. It got down into the 20's F here. I rode the bike to an appointment the next morning and the temp was still in the low 40's. My road is real rough for the first mile until I reach the highway. For the first time ever, my bars were going wild as I drove towards the highway. This has never happened before.
I figure maybe the fluid in the front forks was still cold and possibly thick.

Today it's 50 F outside and a quick ride didn't produce any handle bar fight.
Are these bikes made for only warmer weather?
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post #2 of 13 (permalink) Old 12-09-2007, 04:42 PM
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Don't under-estimate the effect of cold tires
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post #3 of 13 (permalink) Old 12-09-2007, 09:45 PM Thread Starter
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Cold Tires? The thought never occurred to me. Thanks for the tip.
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post #4 of 13 (permalink) Old 12-09-2007, 11:19 PM
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Or extreme exceleration!
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post #5 of 13 (permalink) Old 12-10-2007, 02:42 AM
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or a short chain/wheelbase
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post #6 of 13 (permalink) Old 12-10-2007, 01:22 PM
 
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Get a damper........
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post #7 of 13 (permalink) Old 12-10-2007, 06:55 PM
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Quote:
Originally Posted by Philly
Get a damper........
Hmm...Kinda a generinc 'bandaid' isn't it?

We haven't even diagnosed the issue. Certainly the Brutale isn't lacking a damper due to cost-cutting, but by design.

Also consider that the most vital suspension parts--Your arms and legs--are stiffer and respond more slowly when cold, and MV's are very precisely responsive machines.
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post #8 of 13 (permalink) Old 12-10-2007, 07:32 PM
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Having lost a high speed tank slapper battle on a Kawi many years ago, I am especially sensitive to the issue. It took me twenty some odd years to get back in the saddle and chose a BMW, in part for it's longer wheelbase. Then along came my love affair with this short legged Italian.

My research on the issue never seems to reveal anything conclusive on what can initiate wooble....it can literally be caused by any number or combination of factors...tires, wind, shocks, wheel balance, wheel bearings, frame flex, road surface ... you name it. As one BMW sage stated...when the Donkey starts shaking her head at you, she is trying to tell you something, so back off.

The previous owner of my Brute said it was the most stable bike he had ever owned. However, I couldn't get past the fact that she is wickedly flickable which somehow translated to me (rightly or wrongly) that it was a bit less stable than the Beamer so I opted for the damper. Piece of mind may be all that it gained for me but that is just me.

Thus far I have experienced head shake on only one of the bikes and that was on a very bumpy section of North Shore Dr. at Lake Mead while on the BMW....go figure.

Brock

Brock

I sure do feel a lot more like I do now than when I first got here....

2004 Brutale S
2016 BMW S1000XR
2001 BMW R1100S
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post #9 of 13 (permalink) Old 12-10-2007, 08:01 PM
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Wasn't tirebiter the name of a band?

Welcome to the Forum, sorry for the thread jack.

CAG

Last edited by CAG; 12-10-2007 at 08:05 PM.
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post #10 of 13 (permalink) Old 12-10-2007, 08:05 PM
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As stated by fazer6 I have to agree it is a combo of cold tires, and awkward body tension from the cold. I ride in the cold a lot and I ride her like a scooter when the temps drop below 40f. The tires are worthless in these temps. Go easy and get used to the cold!
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