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The WD Motorcycle forum
Hi I have complete "37" M20. That is an early "37" rear frame section. Based on that frame number, front part of the frame is from "late 38-39" m20. My "37" does not have the threaded holes. There were at least three variants of m20 made in 1937 with slightly different engine and frame parts. I have seen parts from the other two variants. Charlie
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Klaus, looking at the drawing and noticing more variants than I thought, I am not so sure anymore that in your frame the connection needs to be straight instead of curved like it is.. :relieved: :innocent:
Michiel, 1939 M22 you posted was just repainted and restamped KJM22 that was left over from 1938 model row. Later they produced small number of real KM22's with new 1939 engine and frame design. I have seen at least one KM22 stamped engine.
This forum is really great with lots of knowledge and information. I think we can assume that this type of frame was built until 1938. Except for the M24 which had no sidecar connections and frames made of Reynolds tubing.
It's amazing what details come to light.
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Thanks for all the info in this thread. I have front frame HM2398 on the bike I am building up with the later rear end.
Now I have to find a new rear end. The hunt goes on. Not too many early model M20s here that I have seen.
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How is the front end of the rear frame designed to take 39 wider engine? Is it a hybrid from the both types?