Engine stampings?

Discussion in 'Airheads' started by headtube, Oct 11, 2012.

  1. headtube

    headtube 6 mesas de invierno!

    Joined:
    Sep 30, 2012
    Oddometer:
    411
    Location:
    Toronto
    Are engine and frame stampings suppose to match? Today I discovered an engine number while sorting out my center stand. It reads as follows...

    913063

    247/MC3

    What are these for? What do they mean? Thanks.
    #1
  2. disston

    disston ShadeTreeExpert

    Joined:
    Mar 22, 2011
    Oddometer:
    12,363
    Location:
    Silver Spring, Md
    The first number you show is only six digits. If it was a serial number it would have seven. The number 247 is what the basic engine design for all Airheads. BTW R65s are not 247 engines. You might tell us where these numbers are and also what kind of bike, year and model, you have.
    #2
  3. Boxer Metal

    Boxer Metal Mad Scientist

    Joined:
    Nov 3, 2003
    Oddometer:
    3,609
    Location:
    Chico, California

    I would guess that your bike is a 91, the engine was the 63rd one made in week 30 of 1991.
    #3
  4. headtube

    headtube 6 mesas de invierno!

    Joined:
    Sep 30, 2012
    Oddometer:
    411
    Location:
    Toronto
    Hmm, a 91? It's suppose to be a 79 R100 RS. The frame serial is correct for that year and has (7) digits. The engine stamping is located on the left case just above the oil pan.
    #4
  5. Stagehand

    Stagehand Imperfectionist

    Joined:
    Oct 6, 2004
    Oddometer:
    31,835
    Location:
    Shawangunks
    #5
  6. bmwrench

    bmwrench Long timer

    Joined:
    Nov 10, 2006
    Oddometer:
    3,531
    If the motor is from a 79 it would have a seven digit number behind the dipstick hole. This is turning into an interesting motorcycle. Not as in, "May you live in interesting times", I hope.
    #6
  7. headtube

    headtube 6 mesas de invierno!

    Joined:
    Sep 30, 2012
    Oddometer:
    411
    Location:
    Toronto
    There is indeed a seven digit number behind the dipstick that matches the frame number.
    Here is a pic of the engine case stamp.

    [​IMG]
    #7
  8. supershaft

    supershaft because I can

    Joined:
    Sep 9, 2010
    Oddometer:
    9,116
    Location:
    San Francisco Bay area
    BMW just made their millionth motorcylce just a few years back. Of course, that includes all their models ever. I mention it because I don't think a lot of people understand just how low our production numbers are. BMW also just recently cracked the 1% of bikes over 750cc's sold in the US barrier for the first time ever. One percent. Woohoo! And we are their second biggest market!
    #8
  9. Boxer Metal

    Boxer Metal Mad Scientist

    Joined:
    Nov 3, 2003
    Oddometer:
    3,609
    Location:
    Chico, California
    Is there a BMW logo next to the engine number by the dipstick?
    #9
  10. headtube

    headtube 6 mesas de invierno!

    Joined:
    Sep 30, 2012
    Oddometer:
    411
    Location:
    Toronto
    Affirmative. There is one to the right of the serial #.
    #10
  11. DoktorT

    DoktorT BigBrowedNeandereer

    Joined:
    Apr 8, 2009
    Oddometer:
    1,148
    Location:
    Chewelah, WA
    The dipstick no. is the frame no. as originally installled. The no. on the pan perimeter flange is the engine no. No mysteries here.
    #11
  12. bmwrench

    bmwrench Long timer

    Joined:
    Nov 10, 2006
    Oddometer:
    3,531
    FWIW, I believe the 247/MC3 identifies the engines EPA approval.
    #12