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Thread: Cylinder Head Identification

  1. #16
    Registered User b25bsaboy's Avatar
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    Aug 2010
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    Quote Originally Posted by 20774 View Post
    Maybe Rick meant 0.04 meters!! I just measured the valves that came out of my '78 R100/7. The intakes are 42mm while the exhaust are 40mm.
    Kurt, Sorry for the delay in responding to clear the air. Went out and re-measured the inside diameter of the inlet spigot for the 40mm carburetor and it is 41mm.
    Here is the photo that I guess says so!
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    Rick MacPherson
    Success is Not a Destination, But a Journey.
    Accredited Motorcycle Appraiser
    1968 BSA Starfire, 1976 BMW R75/6, 1992 R100RT, 2009 R1200RT

  2. #17
    B Reams brook.reams's Avatar
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    Quote Originally Posted by b25bsaboy View Post
    Good afternoon to everyone,

    Several week's ago I bought a collection of parts for Airheads and Norton Commando parts. There was more Norton parts than Airhead but in the |pile I came up with a dirty pair of double plugged BMW Airhead Cylinder Heads. They were dirty as H*#l and took them and got them Vapor Cleaned at a local shop here in Calgary. The difference is amazing, but I have no idea what these heads will fit, thus I am asking if anyone has any idea what I have?
    On the inside where the valves are it is stamped 30/22.
    Here are pictures of my heads from my 1977 R100RS. The casting number matches yours. I'd call that good for identifying them as 1977 R100 heads.

    IMG_8370.jpg

    IMG_9130.jpg

    Best.
    Brook Reams.
    Brook Reams - Arvada, CO
    Endeavor to Persevere
    Various Two-wheeled Vices, All BMW
    2004 R1150-RS||2002 F650-GS||1983 R100RS||1977 R100RS||1975 R75/6||1973 R75/5

  3. #18
    Registered User b25bsaboy's Avatar
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    Quote Originally Posted by brook.reams View Post
    Here are pictures of my heads from my 1977 R100RS. The casting number matches yours. I'd call that good for identifying them as 1977 R100 heads.

    IMG_8370.jpg

    IMG_9130.jpg

    Best.
    Brook Reams.
    Thank you Brook!
    Rick MacPherson
    Success is Not a Destination, But a Journey.
    Accredited Motorcycle Appraiser
    1968 BSA Starfire, 1976 BMW R75/6, 1992 R100RT, 2009 R1200RT

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