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Thread: 1972 R75/5 - Flywheel Bolts Dimensions

  1. #1
    Registered User b25bsaboy's Avatar
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    1972 R75/5 - Flywheel Bolts Dimensions

    Good afternoon,

    Just dodged a bullet in that I stripped several flywheel bolts. It appears the crank thread internals are fine but I would like to run a tap into the crank threads to make sure there is no bolt burres left behind.

    Does any one have the size needed, as what I found on line is that the bolt is a 10MM X 1.24MM. This came from the Capitol BMW web site.
    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
    Liaison 20774's Avatar
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    RealOEM says they're M10x1.00 and 24mm in length. I suspect they're a high grade steel as well. That's important.
    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. #3
    Registered User b25bsaboy's Avatar
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    Quote Originally Posted by 20774 View Post
    RealOEM says they're M10x1.00 and 24mm in length. I suspect they're a high grade steel as well. That's important.
    Thank you Kurt as this is what I thought, but wasen’t Sure!
    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

  4. #4
    Don't get carried away with the tap. I would use a taper tap turned only with your fingers at first. Then blow out the holes and see how the new bolts turn in the holes. You probably will have to buy a 3 tap set to get a taper tap.

  5. #5
    Registered User b25bsaboy's Avatar
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    Quote Originally Posted by swall View Post
    Don't get carried away with the tap. I would use a taper tap turned only with your fingers at first. Then blow out the holes and see how the new bolts turn in the holes. You probably will have to buy a 3 tap set to get a taper tap.
    Gotcha!
    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
    Registered User AntonLargiader's Avatar
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    There are thread chasing taps that are sized differently than cutting taps. They are available in M10x1.
    Anton Largiader 72724
    Tech articles - YouTube
    Virginia Motorrad Werkstatt BMW motorcycle service and repair in central Virginia

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