Vintage BMW Motorcycle Owners

I am not aware I could buy new SUM carbs... Suppliers?
What kind of airfilter do you recommend for use with the SUM carb?

Best regards, Frode

Yes, I have a Bing on this bike. As far I can see a correct type, and perhaps used on some R12. (http://www.faak-tillmanns.com/shop/u/TVI/BMW_R_12_1-24-12-Horizontal.pdf) Mine is vertical. When I started the restauration it was both a Bing and SUM With the bike, but the condition on the SUM was bad....

Hi! I have a 1938 model R12 military with Bing 1/24/12 carburetor and the original military air filter. No choke function... Problems are starting the bike. I have correct and good spark plugs, can easy change the ignition point for later (retard) and good compression. Even with repeated "tickl...

Hi!
Yes it is a repropart.
280mm aross the widest, and 235mm internal.....

Hi! See photos of my test assembly. - I'm worried that the stand is too close to the ground - If I put on longer spacers between the frame and exhaust to get it higher up, I think it becomes unnaturally large distance. It suits neither particularly well ... - Can there be an opportunity to try narro...

Hi! Sorry for my late reply. I think I've figured it out, and that the spring mounts were not correct. Now I can easily fix the rear screw hole on the footrest. But I still have challenges... When the stand is in upright position it comes in conflict with the tail pipe were it is attached to the fra...

Hi! When mounting the exhaust on the left side of my R11 serie 4, the "stick" for fixing the spring to the central support come in conflict so I can not fasten the rear support under the footboard. Have some of you experienced the same? How have you solved it? Cut of the stick and moved it...

Hi!

Thanks for the reply. It was just like I thought they would be screwed up into footrests.

Regards, Frode

Hi!

Sorry my fault.. Correct question Ian.
It is serie 4.

Greetings, Frode

Hi! I work with the installation of the exhaust system on my R11 serie 4/5. Is the muffler after elbow pipe also attached to the footboard? Or is it just a bolt through? On the pictures I have it almost like it goes a bolt through the exhaust pipe which is screwed into the footrest underneath. Then ...