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1Back to top Go down   front end wobble Empty front end wobble on Mon Jul 28, 2014 3:33 pm

rsexauer

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need a little help, when driving around 50, 60 mph and release my grip on the handle bars the bike begins to slow because I also release my grip on the throttle the front end begins to shake and gets worse down to around 40 mph. When I lightly regain grip the wobble becomes controlable and disappears with a firm grip. At higher speeds I do not notice any more than what I would consider machine vibration, appears normal.
I pulled the front wheel because the tire is wearing on the left side more than the right and removed 2 oz. of weight and tried spinning the wheel to see if it was badly out of balance. Ended taking wheel to local shop to have spin balance performed, shop added back 1.5 oz. of weight in the same place I removed the 2 oz. of weight. wheel bearings worked very smoothly.  Steering head bearings have no play and work very smoothly, maybe too smoothly when the bars are tipped ever so gently past straight the bars go over very quickly. the steering stem nut is tight. I do not have a wrench large enough to try and tension the nut..
What says yee?


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Ray Sexauer
88 K100 LT
0180859
    

2Back to top Go down   front end wobble Empty Re: front end wobble on Mon Jul 28, 2014 3:58 pm

charlie99

charlie99
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lots of posts in here about a similar issue, noticed by many

seems that the thinking is to keep the pressures up so tyre wear imbalences and uneven wear is minimised

camber of the road has a lot to do with left right wear patterns


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%Ofront end wobble Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

3Back to top Go down   front end wobble Empty Re: front end wobble on Mon Jul 28, 2014 8:26 pm

RicK G

RicK G
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If the tyre is worn unevenly then replace it. Usually (90% of the time) it solves the problem.
Uneven tyre wear is caused by over or under inflation more often under inflation. You could fit a steering damper but if you don't want to replace the tyre now just hold on to the bars.


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"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

4Back to top Go down   front end wobble Empty Re: front end wobble on Mon Jul 28, 2014 8:31 pm

krambo

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Out of interest -are you running Bridgestone Battlax BT45 tyres on your machine ? If so then the tyre pressures are critical to stop uneven tyre wear.  The BT45 is a "dual compound" tyre (the middle is harder than the edges) and the tyres can very easily "scallop" or become uneven each side of the middle of the tyre.  If you can actually feel this on your tyre then I suggest that you replace the tyre and keep a careful check on tyre pressures in future if you continue with the same brand.  Personally I really like these tyres now that I know that pressures are critical.  Hope this might help you Wink


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1984 BMW K100RT, 1993 BMW K1100LTIC,1982 Kawasaki KZ1100 Spectre
"Aut viam inveniam aut faciam." front end wobble Uk-bmw12
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5Back to top Go down   front end wobble Empty Re: front end wobble on Mon Jul 28, 2014 10:13 pm

rsexauer

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@krambo wrote:Out of interest -are you running Bridgestone Battlax BT45 tyres on your machine ? If so then the tyre pressures are critical to stop uneven tyre wear.  The BT45 is a "dual compound" tyre (the middle is harder than the edges) and the tyres can very easily "scallop" or become uneven each side of the middle of the tyre.  If you can actually feel this on your tyre then I suggest that you replace the tyre and keep a careful check on tyre pressures in future if you continue with the same brand.  Personally I really like these tyres now that I know that pressures are critical.  Hope this might help you Wink
Metzler lasertec 36psi front Michelin Pilot Activ 38psi rear.


__________________________________________________
Ray Sexauer
88 K100 LT
0180859
    

6Back to top Go down   front end wobble Empty Re: front end wobble on Tue Jul 29, 2014 11:17 am

k75RT Keith

k75RT Keith
Silver member
Silver member
Weight distribution is a major contributing factor to head shake.  How is the bike loaded when it shakes?  

Check the steering head bearings for play and adjust or replace (solved my shake at 100mph).  Check/change fork oil to proper amount and check the front tire for balance, cupping or uneven wear.

After re-reading your post I think this may be useful   
http://www.ibmwr.org/ktech/k75-fork-tuning.shtml



Last edited by k75RT Keith on Wed Jul 30, 2014 10:50 am; edited 1 time in total

    

7Back to top Go down   front end wobble Empty Re: front end wobble on Tue Jul 29, 2014 11:31 am

92KK 84WW Olaf

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@krambo wrote:Out of interest -are you running Bridgestone Battlax BT45 tyres on your machine ? If so then the tyre pressures are critical to stop uneven tyre wear.  The BT45 is a "dual compound" tyre (the middle is harder than the edges) and the tyres can very easily "scallop" or become uneven each side of the middle of the tyre.  If you can actually feel this on your tyre then I suggest that you replace the tyre and keep a careful check on tyre pressures in future if you continue with the same brand.  Personally I really like these tyres now that I know that pressures are critical.  Hope this might help you Wink

My thoughts are exactly the same. A few psi out and they are a different tyre. With the right pressure then very good.


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1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles.
    

8Back to top Go down   front end wobble Empty Re: front end wobble on Tue Jul 29, 2014 2:06 pm

Kyle10

Kyle10
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Also verify that the forks are absolutely true in relation to one another. A mm here or there makes a huge difference.


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1985 K100rt 0052183
1983 Honda VF750 007713 
    

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