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Fork maintenance

Discussion in 'Servicing & Maintenance' started by alain bruneau, Oct 26, 2017.

  1. Lee

    Lee Well-Known Member

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    I'm at the dealer now having Debbie's fork oil changed. She has around 22,000 miles on her RS. The drained oil looks clean.
    In the one pic you can see oil at bottom of the rod. The Tech also put his fingers in the drain pan and the oil on his fingers was clear.

    20171102_123003.jpg

    20171102_123105.jpg
     
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  2. Jim Evans

    Jim Evans Well-Known Member

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    You have to sort of wonder why this oil change is even necessary.
     
  3. Lee

    Lee Well-Known Member

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    Forgot to mention the charge for the fork oil change was 1.7 hours and $25 for the fork oil.

    Rode down to KC today and had mine done today. 28 deg F when I left the house. At least I didn't have fog and rain like yesterday.
     
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  4. Lee

    Lee Well-Known Member

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    Here's a pic of a work in progress of a bike the shop owns.
    I found it interesting you can still buy new parts for these bikes from BMW.
    The rims, fenders and seat were purchased new from BMW recently.
    20171103_132946.jpg
     
    Last edited: Nov 3, 2017
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  5. folagana

    folagana Well-Known Member Contributor

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    my oil was a bit worse

    http://r1200rsforums.com/threads/fork-oil-change.4347/page-2


    does anyone have checked the bushings?

    My RS shows a "clack" noise when I pull the brake move the bike backwards and forwards. I put the bike on the center stand and moved the front wheel backwards and forwards and there is some play 1 or 2 mm.
     
    Last edited: Nov 13, 2017
  6. Aussie Import

    Aussie Import Well-Known Member

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    Steering head bearings need adjustment. Minor issue. Do it soon.
     
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  7. folagana

    folagana Well-Known Member Contributor

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    No, Aussie, the head bearing is ok, I checked. The play is between the stachion the inner tube
     
  8. Aussie Import

    Aussie Import Well-Known Member

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    In that case it could be a major wear issue or some sort of mechanical failure. Never had that sort of wear myself.
    I have had clunking under brakes (disc only) but I can't remember what caused it. Think it was something minor like a small remaining spring behind a pad.
     
  9. folagana

    folagana Well-Known Member Contributor

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    yes I think so

    I'm very lucky.... I feel bad just thinking I have to disassemble the fork again....
     
  10. Duckbubbles

    Duckbubbles Active Member

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    Could it be the brake pads moving fore and aft in the calipers?

    Frank
     
  11. Lee

    Lee Well-Known Member

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  12. Lee

    Lee Well-Known Member

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    I asked the Tech about checking the steering bearing.
    He said to grab the gold part of the forks instead of the lower part when checking.
    He said if I grab the lower part of the fork I would feel play.
     
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  13. folagana

    folagana Well-Known Member Contributor

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    the problem is a dangerous vibration at high speed >170 km/h that I discovered some weeks ago.

    I don't know if it is due to the front tyre or to the bushings but I suspect the problem is the bushing because of the play (I think it is too much for my experience)
     
    Last edited: Nov 13, 2017
  14. folagana

    folagana Well-Known Member Contributor

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    As your tech suggested I checked the bearing from the bottom part of the stachion (the gold one) and the bushing from the bottom part of the inner tube....

    The first one do not show play. The second yes.

    As you reported, the black oil is not a good sign, it is the result of some iron particles mixed with the oil. Are they coming from the bushing? It should be or it is better it is....
     
  15. oscarguitar

    oscarguitar Well-Known Member

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    The ‘clack’ could be the discs. They are ‘floating’ and have clacked on both of my RS’. I too thought it was the head race, but ‘my’ tech showed me it was actually the discs doing their thing
    The vibration at 170 plus could be a cupped front tyre. The PR4s can vibrate a bit as they wear.
    Hope you get it sorted soon and let us know the cause.
     
  16. folagana

    folagana Well-Known Member Contributor

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    The tyre is a metzeler z8 interact near to his end of life. I run 2 set of PR4 without problem. I hope you are right Oscar. I'll change my tyres soon. In the meantime I'll visit my local dealer to check the fork just get a feedback.
     
  17. folagana

    folagana Well-Known Member Contributor

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    hi folks

    I finally fixed the problem. The fork play is in line with the expected even if it is strange at 33.000 km the local dealer said.

    I removed the old Z8 and installed the new roadtec 01. The problem disappeared.
    The tyre dealer checked carefully the front tyre. There weren't anomalies on the external side. No cupping at all.

    Once the tyre was deflated he found a serious problem inside. Unfortunately I didn't take a photo but there was a sort of swelling. The dealer supposes the tyre was like peeled as if some internal layers were detached. I never saw such type of failure and I used many Z8 tyres in the past with satisfation.

    Perhaps it was already damaged since the beginning but I didn't feel the problem.
     
  18. Aussie Import

    Aussie Import Well-Known Member

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    A delaminating tyre with movement being heard and felt. Well, that is useful to know as a potential cause.
     
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