My project is what I assumed to be a late (solid flywheels) 1921 61cu, magneto V-twin. To the best of my knowledge it is an original bike - not a kitset of parts. Frame No. 21F 5400. Motor No. 21F 5801.
Two questions. (1) Does this seem to the experts out there like a "matching" frame and motor, given the serial nos. are 400 apart? (2) Given that there were only about 2400 21Fs produced, how come the serial nos. on my 21F are over 5000?
If the answer to the second question is that frames and crankcases were stamped initially with a sequential serial number for the year, and then later stamped F/J/FD/JD depending on the model for which they were used in the engine building and motorcycle assembly shops, then my bike looks as if it were not assembled all that late in the programme for the 1921 releases, given that there were about 10,000 V-twins of all types produced for that year.
Apologies if this has been covered before. I scanned previous posts but couldn't find a thread that covered this ground.
Two questions. (1) Does this seem to the experts out there like a "matching" frame and motor, given the serial nos. are 400 apart? (2) Given that there were only about 2400 21Fs produced, how come the serial nos. on my 21F are over 5000?
If the answer to the second question is that frames and crankcases were stamped initially with a sequential serial number for the year, and then later stamped F/J/FD/JD depending on the model for which they were used in the engine building and motorcycle assembly shops, then my bike looks as if it were not assembled all that late in the programme for the 1921 releases, given that there were about 10,000 V-twins of all types produced for that year.
Apologies if this has been covered before. I scanned previous posts but couldn't find a thread that covered this ground.
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