Frame Numbers

L.A.B. said:

olChris said:

Ok its not a 73, but why would my "April 72" frame, engine and gearbox have these numbers stamped....... Some can suggest that these may be false stampings but being a BM/W for 40 years and has "stamped" a squillion articles, i feel confident that my numbers are original stamps............

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That frame has had some serious modifications, so it seems plausible that person responsible also removed the plate and welded over the rivet holes and re-stamped the number onto the frame. Somehow I doubt that stamp is original, even if the serial number is correct.

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Re: Strange Frame
Postby olChris » Tue Dec 10, 2013 7:59 pm

olChris wrote:
Matt, I quickly browsed that link to serial number and folks say "Red Plate" Yes vin Plate, mine has none or any rivit holes where it normally attached ?????? So none was ever attached?? Can that be the norm??

For me i have no doubt that the stampings are original. If we disagree then so be it..


From a previous post

On closer inspection the Vin Plate rivit holes are present... Punched out the "plugs" of weld and now have 4 holes for the plate..........

olChris
Posts: 443
Joined: Sun Oct 06, 2013 7:07 pm
Location: Mandurah, W.Aust.

my Ontario ownership reports the following numbers '750RS2208XX', while the plate which is riveted on the frame just reports '2208XX'
is it normal? is there an issue with the onwnership?

Lorenzo said:

my Ontario ownership reports the following numbers '750RS2208XX', while the plate which is riveted on the frame just reports '2208XX'
is it normal? is there an issue with the onwnership?

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They probably need so many alpha numeric characters for the system to recognize it. No big whoop.

L.A.B. said:

The spine tube is the most obvious one to check. If 'Imperial' it will be 2 1/4" O/D (so about 57-58mm), if 'metric', 60mm O/D.

If I remember correctly, I think we've had a few reports of Imperial tube frames having the 'frame' number, so that also throws the "Imperial tube = Reynolds, metric tube = Italian" frame theory into question.

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The frame on my 74 has imperial diameters, AND has an "F1" frame number.

My bike was manufactured 6/74, has down tube diameters of 25.35-25.40 mm (with paint), and has a neck serial number stamped on the right side of the neck just ahead of the tank edge as shown below.