Jerking handlebars sometimes on my LT. - BMW Luxury Touring Community
 
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post #1 of 11 Old Dec 1st, 2011, 2:30 am Thread Starter
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Jerking handlebars sometimes on my LT.

Hello everybody from RUSSIA
This summer was a 1-st season on my 99' k1200lt
Sometimes a have a trouble with the handling.
Did someone met this situation?

Something starts to jerking the handlebars left and right and the motorcycle comes to unbalance.
That was happened with me 2 times.

Did someone has the same situation, when it happeneds and what did you do to back the motorcycle to the right balance?
Thank you.
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post #2 of 11 Old Dec 1st, 2011, 2:44 am
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Re: Jerking handlebars sometimes on my LT.

Check the wear in your front and rear tires.
Check that the air pressure is 42 psi in front and 48 psi in back
check your steering damper
check that the tires are correctly balanced.
Never let go of the handlebars while riding down the road.
Any one of these can cause you to possibly end up with a tank slapper.

Courage doesn't always roar. Sometimes it is the quiet voice at the end of the day saying " I'll try again tomorrow".


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post #3 of 11 Old Dec 1st, 2011, 3:18 am Thread Starter
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Re: Jerking handlebars sometimes on my LT.

Technically everything is OK.
The pressure and other is ok, tires are alightly used (2000 miles)
Shocks are OHLINS.
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post #4 of 11 Old Dec 1st, 2011, 5:46 am
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Re: Jerking handlebars sometimes on my LT.

This situation is often referred to as a "tank slapper". This post http://www.bmwlt.com/forums/showthre...t=tank+slapper
has a number of suggestions as to what the problem might be.

If you use the search function for the words tank slapper you might be able to find more information.

Good luck to you,

Loren

WAK1200LT
Loren

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Cave quid dicis, quando, et cui
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post #5 of 11 Old Dec 1st, 2011, 5:59 am
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Re: Jerking handlebars sometimes on my LT.

This could be a serious safety issue for you. I personally wouldn’t ride the bike again until at least the front wheel is raised off the ground and the suspension is given a good inspection. Safety first, and always.
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post #6 of 11 Old Dec 1st, 2011, 8:26 am
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Re: Jerking handlebars sometimes on my LT.

at what speed were you driving when it happened
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post #7 of 11 Old Dec 1st, 2011, 11:31 am Thread Starter
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Re: Jerking handlebars sometimes on my LT.

For the 1-st time it happends was this:
http://www.naplevat.ru/misho

As you can see there is some problem with the surface, when i "catch" this line the handlebars starts to twist right and left and finally i have drop the bike on the ride side.
Then i repaired the bike, change everything was needed at the service station.
But then it happends againg at about 60MPH when i catth some line like this, but is was something like split on the asphaltum.

Maybe i need to change the front spring adjuster on my ohlins?
Or maybe the ohlins is too bad for bad asphaltum?
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post #8 of 11 Old Dec 1st, 2011, 1:27 pm
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Re: Jerking handlebars sometimes on my LT.

Mike, After a collision like the one you had this summer, it could be that your front suspension is damaged. If you are able to take the bike to a BMW dealer, you would want to have all the front suspension parts checked out throughly before riding the bike again. Or if you can find another LT, you can check the clearance measurments from one bike to another to see if the front end geometry may be incorrect. My one question about the 60mph handlebar wiggle, did this occurr on deceleration? or were you accellerating? Was there any damage to the front wheel or tire from the accident. Have you checked the front wheel by lifting it off the ground and spinning it and looking for any abnormalities in the front wheel/tire? As far as your accident, looking at that road, I would imagine the wheels getting stuck trying to get over that height difference. Hopefully you were not injured in the accident.

RICH CANNON
2000 K1200LT "a great ride"
2002 GL1800 powerful, but boring..(gone)
1979 XS1100 (gone)
1986 VT500 Ascot (gone)
1972 Honda 500-4 (gone)
1961 Lambretta (way gone)
1962 Allstate Compact (gone but not forgotten)
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post #9 of 11 Old Dec 1st, 2011, 3:38 pm
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Re: Jerking handlebars sometimes on my LT.

If you are new to the LT you may have aggravated the problem by grapping the bars and trying to stop the wiggle. Just keep your hands on the bars but do not fight the bike, usually adding throttle will take care of the problem. Have the front end checked as everyone said but do not try to over control the bike, this just makes the shaking worse. "Loose on the bars" Kieth
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post #10 of 11 Old Dec 1st, 2011, 5:26 pm
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Re: Jerking handlebars sometimes on my LT.

I don't think there is anything wrong with the bike. You just need to avoid a deep narrow groove in the pavement like that in the picture. Any large heavy motorcycle will suffer in that especially at low speeds. Just need to stay away from that groove. I don't think I could have done any better with it.

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 11 Old Dec 1st, 2011, 6:50 pm
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Re: Jerking handlebars sometimes on my LT.

After seeing the photo's I agree. That groove would be no fun unless you where on a trail bike.
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