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sblaylock
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VBMWMO #8384
Joined: 07/22/2010
Posts: 106

I'm helping a friend tuneup his newly acquired R90S and have noticed there are three lines associated with the "S" mark on the flywheel. There's a line below and above the "S" and then another above the upper line (see attached photos). I'm assuming the top most line is the correct one, but wanted to be sure before adding white paint marker.

Not sure why but the photos rotated when I uploaded them.

Thanks,
Scott.

  • 20171001_150641.jpg
  • 20171001_150653.jpg
schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
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The middle line is the

The middle line is the correct one.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

sblaylock
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Thanks Kurt.

What do the other two lines represent? OT above has it's own line and F below has the dot.

*** EDIT ***
Disregard. I found a document that explains the other two marks - "Allowable Variation between Right and Left Cylinder"

Thanks again,
Scott.

  • flywheel-markings-5-6-7-models_butlersmith.jpg
schrader7032
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San Antonio, TX
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Curious...what is bulletin

Curious...what is the bulletin number for that?

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

sblaylock
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Brook Reams

I can't seem to find a bulletin number for that page. I found it on Brook Reams web site, under "12 BMW 1977 R100RS Changes To Ignition For Dual Plug Heads", where he references getting it from Bob Fleischer's (Snowbum) site. The referenced document is a link near the bottom of this page on Snowbum's site: http://bmwmotorcycletech.info/F,OT,S,Z.htm

Scott.

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