BMW K bikes (Bricks)

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1Back to top Go down   Knock from front Empty Knock from front Sun Jun 12, 2011 8:37 pm

chrish8846

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Went for a ride several days ago on the K100 and heard a knock from the front end when braking and turning into a parking lot. I thought the horns were hitting the fairing. I moved the horns and still have the noise. I can duplicate noise if I sit on the bike and hold the front brake and compress the front forks. It sounds like it's coming from one of the forks. Any ideas on what to look for???

    

2Back to top Go down   Knock from front Empty Re: Knock from front Sun Jun 12, 2011 9:10 pm

blaKey

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How long since the fork oil was changed? Any leaks at the drain bolts?
Type of oil used?
Check the tightness of all of the bolts for the front end (mudguard, triple clamps, brake caliper mounting bolts, axle pinch bolts etc).


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Neil
K100RS 1986 RED!

Dress for the ride and the potential slide.
    

3Back to top Go down   Knock from front Empty Re: Knock from front Sun Jun 12, 2011 9:14 pm

RicK G

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The only thing that comes to mind is the allen bolt which is up the center of the leg from the bottom may be lose but I would expect to have some oil evident as well. Would pay to check that (you will need to remove the front axle to get at it) and renew the oil as I am thinking worn out oil that is as thin as water could let it rebound a lot quicker than desired and cause a knock at the top out.
Another thought is with the axle out check the wheel bearings.


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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   Knock from front Empty Re: Knock from front Sun Jun 12, 2011 10:09 pm

chrish8846

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Oil just changed,muddy water came out,atf back in,no leaks,I have checked all mounting bolts but have not checked wheel bearings although when I installed the front tire they turned smoothly. I'm thinking internal in the fork. I will advise. I will say that the forks compress very easily, when I jack the front wheel off the ground I can compress the forks about 2 inches just by lifting up on the wheel then it starts to get firmer. Normal?


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Chris Hammond
1985 K100 RT sold
1992 K75RT still in Fixing mode
    

5Back to top Go down   Knock from front Empty Re: Knock from front Sun Jun 12, 2011 11:30 pm

RicK G

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That sounds like the springs have had it. Try to get a known good spring and compare but I think you will find a shagged spring or two.

    

6Back to top Go down   Knock from front Empty Re: Knock from front Mon Jun 13, 2011 5:33 am

charlie99

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better have a look at the schematics chris ....theres a few o rings in the lower part of the legs .......and as k_freak suggested ...maybe the springs have settled (for want of a better word ) .

there are also shims in the top end to take up slack between the spring , spacer and circlip holding them all in place ...maybe a check could be conducted .

raise the front wheel (bike on centre stand and jack up under the sump so the front wheel lifts off deck) ...undo the caps at the top and see if there is slack (space ) between the shims and circlip ?

maybe a set of "progressive" springs might be a good option for replacement, there may be many other options, just one that came to mind .


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'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OKnock from front 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 ..
    

7Back to top Go down   Knock from front Empty Re: Knock from front Mon Jun 13, 2011 6:33 am

chrish8846

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I'll check the springs today and let you guys know whats going on.


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Chris Hammond
1985 K100 RT sold
1992 K75RT still in Fixing mode
    

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