Bad front end shake/tank slap when decellerating abruptly from 40 mph - BMW Luxury Touring Community
 
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post #1 of 12 Old Apr 10th, 2014, 7:02 pm Thread Starter
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Bad front end shake/tank slap when decellerating abruptly from 40 mph

Hey guys!

Been a while since I've been here. trying to sort out a front end near tank slapper like handle bar oscillation on a 2006 K1200LT with only 12,000 miles on it.

Its most pronounced when abruptly rolling off the throttle at about 40 mph with very light hand pressure on the handle bars. We just put a new tire on it, thinking that would fix it. No change. I have thought I heard a bit of clacking in the area of the front end with rolling throttle on and off quickly and loading/unloading the suspension.

Any ideas?

BC


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Last edited by wildwestrider; Apr 10th, 2014 at 8:05 pm.
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post #2 of 12 Old Apr 10th, 2014, 7:18 pm
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Re: Bad front end shake/tank slap when decellerating abruptly from 40 mph

Could be the front or rear tire, weak shocks, loose bearings on the swing arm attachment points, bad ball joint up front, bad balance, or a bad steering damper. Personally, I think out of round tires or stretched beads is the cause. That's my opinion. There are lots of others out there. It is a common problem. I have not had it occur since I started being very careful about stretching the beads when mounting my tires. If you hear a "pop" when you are spooning the new tire on, it is my belief you have streched the bead and you will have the problem.


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post #3 of 12 Old Apr 10th, 2014, 10:03 pm
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Re: Bad front end shake/tank slap when decellerating abruptly from 40 mph

My bet is on steering dampener. Freshen up the oil and maybe new seals.

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post #4 of 12 Old Apr 10th, 2014, 10:07 pm
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Re: Bad front end shake/tank slap when decellerating abruptly from 40 mph

I had a new front that developed that as soon as I changed it. Turned out the new tire was out of round by 1/4 inch. This is almost always caused by a tire problem, front and rear both can cause it.

John
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2004 330 Ci Convertable
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Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #5 of 12 Old Apr 10th, 2014, 10:25 pm
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Re: Bad front end shake/tank slap when decellerating abruptly from 40 mph

Including tire issues check the pressures.
Most run higher than recommended.
I use 40 psi front and 46 psi rear.
Some use 42 / 48.
Can sometimes help.
Or just hold onto the bars.

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post #6 of 12 Old Apr 10th, 2014, 10:31 pm
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Re: Bad front end shake/tank slap when decellerating abruptly from 40 mph

Quote:
Originally Posted by wildwestrider View Post

We just put a new tire on it, thinking that would fix it.

BC

I've had Bridgestones and Metzeler tires on the front and both did it, the Metzeler's the worst. Currently have a new Bridgestone and there is no wobble whatsoever. But before mounting the tire I found the heavy spot of the rim, aligned the yellow mark on the tire with the heavy spot on the rim, and carefully balanced the wheel.

If you cannot find the heavy spot on your rim, align the red mark on the tire with the tire valve. If the tire is currently mounted like that, or if your new tire doesn't have any markings, try rotating the tire 90 degrees on the rim and rebalance it. There is no guarantee that this will fix your problem, but at least you will have the satisfaction that you tried.

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post #7 of 12 Old Apr 10th, 2014, 11:25 pm
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Re: Bad front end shake/tank slap when decellerating abruptly from 40 mph

Quote:
Originally Posted by wildwestrider View Post
. We just put a new tire on it, thinking that would fix it. No change..
did you balance it?

True Wisdom Only Comes From Pain.


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post #8 of 12 Old Apr 11th, 2014, 10:40 am
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Re: Bad front end shake/tank slap when decellerating abruptly from 40 mph

If I remember right, when the changed the suspension geometry it created a problem with this.

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post #9 of 12 Old Apr 11th, 2014, 10:46 am
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Re: Bad front end shake/tank slap when decellerating abruptly from 40 mph

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Originally Posted by 14wntr View Post
If I remember right, when the changed the suspension geometry it created a problem with this.
Say what ???

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post #10 of 12 Old Apr 11th, 2014, 11:01 am
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Re: Bad front end shake/tank slap when decellerating abruptly from 40 mph

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Originally Posted by johnT View Post
Say what ???
They changed the rake angle slightly (63.00 vs. 63.96) on the 05 and up units, but tires are almost always the cause. I have re-balanced part way through the wear of a front (installed Smartire system) and the previous wobble went away with that tire.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #11 of 12 Old Apr 11th, 2014, 11:09 am
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Re: Bad front end shake/tank slap when decellerating abruptly from 40 mph

Quote:
Originally Posted by ktmdrz400 View Post
My bet is on steering dampener. Freshen up the oil and maybe new seals.
If the steering is damp, then all you have to do is dry it off.
However I don't believe that the steering damper plays That much of a role on this bike.
If you're hearing clanking or clunking from your front end, You'd better check that out soon.
Bike on center stand, scissor jack & wood block under engine to lift the front.
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post #12 of 12 Old Apr 11th, 2014, 1:43 pm
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Re: Bad front end shake/tank slap when decellerating abruptly from 40 mph

Quote:
Originally Posted by jzeiler View Post
They changed the rake angle slightly (63.00 vs. 63.96) on the 05 and up units, .
Yeah.
I know

But the bike is 8 years old.

If it was a problem with the rake, I think it would
Have been noticed long ago

Headshake in most bikes is due to tires
Also steering head bearings

I have not taken apart an LT front end yet
So
Not sure what parts may or may not be worn or loose.

True Wisdom Only Comes From Pain.


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