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Thread: Valve clearances

  1. #16
    Registered User toooldtocare's Avatar
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    stolen from the internet

    The markings are in the cutout for the plugs R/L
    Attached Images Attached Images

  2. #17
    Liaison 20774's Avatar
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    ^^^ Those markings are NOT on my /7 valve covers.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  3. #18
    Registered User toooldtocare's Avatar
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    Quote Originally Posted by 20774 View Post
    ^^^ Those markings are NOT on my /7 valve covers.
    They were on my mono-shock bikes (88 R100RS, 86 R80RT, and 95 R100RT. I'm not sure about the Motorsport though.

  4. #19
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    Quote Originally Posted by 20774 View Post
    nevadaslim -

    Those numbers are not part numbers...they are likely mold numbers used internally by BMW to track parts production.

    I don't have pictures of the inside of my /7 valve covers, but I think I remember seeing Links and Rechts on the inside, German for left and right. But it's easy enough to figure out which side they go on. Take one of them and just slide it onto the head. If the lines on the cover essentially draw a connection between the intake port to the exhaust port, they are on the proper side. Otherwise, swap covers.

    Thank-you,

    Ok I got it, Links and Rechts. Now that I have a BMW, I need to brush up on my German.
    Oh, and I found the little-"R", and the "little "L"(thanks tooldtocare), they are on the outside middle of the covers. At the top, or borrom, not sure, is there a difference? Thanks again for all the replies and photos.

    Right.jpg

    %22R%22.jpg

  5. #20
    Liaison 20774's Avatar
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    Once you figure out which cover goes where, it doesn't matter if the "R" is up or down. Try it and see! I'd put the letters up, so that when you look down, you can answer the question of driver's Left or Right!
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  6. #21
    Nick Kennedy
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    This is just my personal preference but on my 1978 R/80 I try to set in intakes at .005 and the exhaust at .007, that's what I aim for.
    I also check my head bolt torque but I do not loosen them up and I only go to 25 ft. lbs of torque, I don't want to upset the apple cart and Do Not want for sure to pull any long hold down studs out of the engine case.
    But that's just me.
    I cut my teeth on VW's in the seventy's and we went through a lot of valves and blown engines as kids.

  7. #22
    jimmy armour
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    noisy valves

    Hi, heres my story re noisy valves, on my 1977 r100 s I always check the valve clearences cold before I adjust them,lets me know if the are tightening over time, this is what I did and advise anyone who wishes to listen, in 1985 bmw modified the rocker arms and installed quietening spacers (nylon top hats) to stop the up and down movement in the arms ,you can get them from your dealer along with adjusting shims ,also remove all the rocker arms marking right an left,removing the needle rollers ,take them to a machine shop and have them remove the same amount as the nylon top hat,reinstall the assy I adjust the valves 4&6 slideing fit,then re check with the 6&8 tight fit ,I did this mod as soon as the parts were availble in 1985 or 86, they are much quieter and need checked more than adjusted ,I replace the nylon top hats every few years as they harden over time,there is also little rubber buffers that are slid between the head fins along where the studs are to help with cylinderhead fin ringing ? I have put well over 150,000 miles since doing this mod and am happy I did, hope this assists Jimmy

  8. #23
    Registered User ebeeby's Avatar
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    1973 R75/5 - 6 and 8
    1973 R75/5

  9. #24
    Quote Originally Posted by ebeeby View Post
    1973 R75/5 - 6 and 8
    +1
    Paul Glaves - "Big Bend", Texas U.S.A
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  10. #25
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    Quote Originally Posted by jimwjarmour View Post
    Hi, heres my story re noisy valves, on my 1977 r100 s I always check the valve clearences cold before I adjust them,lets me know if the are tightening over time, this is what I did and advise anyone who wishes to listen, in 1985 bmw modified the rocker arms and installed quietening spacers (nylon top hats) to stop the up and down movement in the arms ,you can get them from your dealer along with adjusting shims ,also remove all the rocker arms marking right an left,removing the needle rollers ,take them to a machine shop and have them remove the same amount as the nylon top hat,reinstall the assy I adjust the valves 4&6 slideing fit,then re check with the 6&8 tight fit ,I did this mod as soon as the parts were availble in 1985 or 86, they are much quieter and need checked more than adjusted ,I replace the nylon top hats every few years as they harden over time,there is also little rubber buffers that are slid between the head fins along where the studs are to help with cylinderhead fin ringing ? I have put well over 150,000 miles since doing this mod and am happy I did, hope this assists Jimmy
    I've seen those anti-ringing rubber buffers you're referring to. Do you know anything about installing them? I was wondering if you just press-fit them in between the fins, or if you need to use some sort of adhesive to hold them in place?

  11. #26
    Liaison 20774's Avatar
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    Quote Originally Posted by nevadaslim View Post
    I've seen those anti-ringing rubber buffers you're referring to. Do you know anything about installing them? I was wondering if you just press-fit them in between the fins, or if you need to use some sort of adhesive to hold them in place?
    I think Jim was talking about something inside the valve cover. Snowbum has a small article on the rubbers between fins on the outside. Looks pretty simple to install.

    https://bmwmotorcycletech.info/quietingpads.htm
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  12. #27
    Registered User toooldtocare's Avatar
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    Quote Originally Posted by nevadaslim View Post
    I've seen those anti-ringing rubber buffers you're referring to. Do you know anything about installing them? I was wondering if you just press-fit them in between the fins, or if you need to use some sort of adhesive to hold them in place?
    They are small rubber disc that simply press in between the fins. They do help, they came standard on my mono-shock bikes, and I added them to my 78 RS. However, they do not make the bike silent, you will still hear the valves. I always set mine at 6 and 8 thousands due to a service bulletin that came out after valve recession became a problem.

    Wayne

  13. #28
    jimmy armour
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    rubber buffers

    Hi again glad you read my answer the rubbers slip between the fins mine havent moved in at least 10 years, bye for now Jimmy ps the valves can still be heard a good sign ear plugs is the real answer,

  14. #29
    Registered User lkchris's Avatar
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    Apples/oranges... the rubber fin buffers are NOT the nylon rocker spacers. BOTH were added to later models. I think the actual rocker arms are different to accommodate the spacers.

    The fin buffers address fin ringing. The rocker spacers address valve train noise.
    Kent Christensen
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    '12 R1200RT, '02 R1100S, '84 R80G/S

  15. #30
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    Quote Originally Posted by 20774 View Post
    I think Jim was talking about something inside the valve cover. Snowbum has a small article on the rubbers between fins on the outside. Looks pretty simple to install.

    https://bmwmotorcycletech.info/quietingpads.htm
    Thanks 20774, I was referring to his last sentence, "...there is also little rubber buffers that are slid between the head fins along where the studs are to help with cylinderhead fin ringing ? I have put well over 150,000 miles since doing this mod and am happy I did, hope this assists, Jimmy."

    Thanks for your info, Jimmy.

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