Need help identify a machine

Micha · Post by **Micha** » Thu Jul 31, 2014 10:27 am

hello. Frame number 529762 and engine number 530294:
Can someone please tell the model and production year?
I think it is an R51/3, but want to be sure.
Thanks a lot!
Michael.

iagins · Post by **iagins** » Thu Jul 31, 2014 11:01 am

I plugged the numbers into the boxes on the left. They are, in fact, R51/3 numbers.

You may be able to obtain the production and delivery dates from the BMW Archive folks at

info.grouparchiv@bmwgroup.com.

Ira Agins
Santa Fe, NM

Peter · Post by **Peter** » Thu Jul 31, 2014 8:10 pm

Hi Micha, the frame would appear to be a very late 1952 (November or December) or early 1953 the engine is likely the same, I'm guessing December/January.

Micha · Post by **Micha** » Fri Aug 01, 2014 6:45 am

Thank you all.

speight1823 · Post by **speight1823** » Sat Aug 02, 2014 7:48 am

A friend of mine has an R26 he has just restored. The bike runs fine but when he taps off the throttle the bike carries on revving for about 10 seconds which makes gear change difficult . The only thing I can find wrong is the carb slide has about 0.5 mm clearance on the carb bore. The wear is all on the bore at the bottom of the carb bore.
The only repair I can think of is to bore out the worn bore of the carb and to sleeve the slide with 2 thin brass sleeves ,spit horizontally around the small locating key.
Has anyone done successful worn carb body overhauls? What method did you use?
What would the as new clearance be on a 29.5mm dia Slide?
Bill

C.K · Post by **C.K** » Sat Aug 02, 2014 3:12 pm

This problem is typical for ignition advance -weight,springs.
Avi.

Vintage BMW Motorcycle Owners