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Thread: 1972 BMW R75/5 - Valve Push Rod

  1. #1
    Registered User b25bsaboy's Avatar
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    1972 BMW R75/5 - Valve Push Rod

    Good evening to you all,

    Pulled the heads and cylinder barrels off the 72 BMW R75/5 and to my surprise I discover that the value push rods are not all the same and one in particular had no holes on each end for the oil gallery. I thought this odd, as all the R75 & R 100 were the same with these small holes.

    Is this something to be concerned about, as I am thinking of replacing all of them.
    Rick MacPherson
    Success is Not a Destination, But a Journey.
    Accredited Motorcycle Appraiser
    1968 BSA Starfire, 73 R75/5 SWB, 2008 Honda GL-1800 Lehman Trike

  2. #2
    Yes
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  3. #3
    Airmarshal-IL James.A's Avatar
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    Unless you buy a bike from the original owner with low miles, you are likely to find all sorts of deviate goings on.
    You can replace them all if you wish, but I would point out that the motor was running that way at some place in time. Push rods are, essentially, long spacers, nothing more. My understanding of the oiling system does not indicate an oil gallery anywhere near the push rods.
    1973 R75/5

  4. #4
    #4869 DennisDarrow's Avatar
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    Had that problem with my 52 flathead V8 Ford... .Change em out for sure......

  5. #5
    Registered User b25bsaboy's Avatar
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    Quote Originally Posted by b25bsaboy View Post
    Good evening to you all,

    Pulled the heads and cylinder barrels off the 72 BMW R75/5 and to my surprise I discover that the value push rods are not all the same and one in particular had no holes on each end for the oil gallery. I thought this odd, as all the R75 & R 100 were the same with these small holes.

    Is this something to be concerned about, as I am thinking of replacing all of them.
    Thank you for the response to my question for the valve push rod question. Late last night I contacted a re-seller and wanted to buy some value push rods from him that he had for sale that looked correct and they were 10.75" long. He came back to me this morning and advised that I needed part # 11 32 1 259 607 push rod they changed in 09/75 they are 27.5mm or inches? long. Now I am confused, as I think that there is a mis print on his email response
    Rick MacPherson
    Success is Not a Destination, But a Journey.
    Accredited Motorcycle Appraiser
    1968 BSA Starfire, 73 R75/5 SWB, 2008 Honda GL-1800 Lehman Trike

  6. #6
    #4869 DennisDarrow's Avatar
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    open your thumb and forefinger......Make the "C" that is about 28mm...….The wrench size for your swing arm locknut is 27mm...…….Perhaps you are the fella means centimeters.

    Measure ALL OF YOUR EXISTING devices, 4, and I bet that is the size you need. Probably need to have metric.....

  7. #7
    Liaison 20774's Avatar
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    I thought I had seen an image of different pushrods laid out beside each other...can't seem to find that now. It does appear that the length changed after 9/75. My Haynes and this site:

    https://w6rec.com/bmw-motorcycle-eng...-later-models/

    show that the post 75 bikes have 275mm pushrods but the length for anything else is not available...that's probably the misprint as in 275 and 27.5mm.
    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!

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