Help finding year and model of a Single

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mtl66cars

Help finding year and model of a Single

Postby mtl66cars » Sat Oct 31, 2015 12:22 am

Hello
Just purchased a BMW single with the Serial # 6272358 Same number on frame and motor. Does not seem to fit with any of the info on line. Can anyone tell me the year and model. Looks like an R26 Thanks
DSC04403 (800x536).jpg
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Bill Smithson
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Re: Help finding year and model of a Single

Postby Bill Smithson » Sat Oct 31, 2015 10:02 am

Hi,
The engine and frame numbers don't appear in any of the large dossier of information I've gathered over the years. I have an R25/3 plus an R27. If the numbers don't have the BMW roundel punched in at each end of the 6 digit number it can't be relied on.
Without a clearer photo your machine appears to be an R26, the later R27's have a rubber mounted engine and a robust engine support across the front of the motor. Check for 2 large lugs welded either side of the frame to carry the frame/engine brace.
The tank on both models R26 and r27, should have a toolbox in the top of the tank, but that could have been modified in the past to give more fuel capacity. Also you need the air box and battery covers to complete the bike.
A good source of information is the German BMW Einzylinder forum http://www.bmw-einzylinder.de. There is a wealth of information there as you would expect and the forum members, having met a lot of them, are exceptionally helpful and friendly. If I can help with anything please contact me.
Good luck with your project.

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boxerman
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Re: Help finding year and model of a Single

Postby boxerman » Sat Oct 31, 2015 10:32 am

Certainly looks like an R26 but the number you quote relates to an R45 from Feb 1982. As far as I'm aware all engine numbers from this era would be 6 digit not 7. I'd suggest carefully checking the numbers again
Phil Hawksley 'The Boxer Man' - aka 'Dangermouse'
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mtl66cars

Re: Help finding year and model of a Single

Postby mtl66cars » Sat Oct 31, 2015 5:25 pm

Here is a photo of the frame # motor # motor mounts and other side of the bike
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Re: Help finding year and model of a Single

Postby mtl66cars » Sat Oct 31, 2015 5:28 pm

DSC04404 (640x428).jpg
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Bill Smithson
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Re: Help finding year and model of a Single

Postby Bill Smithson » Sat Oct 31, 2015 7:00 pm

The first picture shows a genuine number stamped in my spare single cylinder crankcase.
It appears that the numbers you have are not genuine, Note the indented BMW roundel logo at the start and finish of the sequence of digits. I have heard that some dealers were able to stamp numbers on a replacement engine supplied by BMW but that may be just another urban myth.

Image

The picture below shows one of the engine lugs on my R27.
The lugs carry a cross member which supports the front of the engine. The engine bolts on earlier single cylinder models pass through the crankcase as shown on yours.
My opinion is that you have an R26 and if you check Phil's information on here you may get a rough approximation of the year date. Unfortunately without a genuine number to work by, BMW archives service will not be able to help.

Image

mtl66cars

Re: Help finding year and model of a Single

Postby mtl66cars » Sat Oct 31, 2015 7:40 pm

Seeing the photo of your motor serial # is very helpful . My numbers are stamped under the oil fill plug . My bike has no numbers stamped in the same place as yours and the casting looks all original. The motor case must have been replaced and the frame re stamped . Does someone have a photo of a frame # ? My frame number is stamped left from center on the steering neck . I will remove the paint and see if I can find some other number. Thanks for all the help
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Re: Help finding year and model of a Single

Postby mtl66cars » Sat Oct 31, 2015 8:34 pm

Found another number stamped right from center on the steering neck 348092

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Re: Help finding year and model of a Single

Postby Bill Smithson » Sat Oct 31, 2015 9:25 pm

Hi again,
I found this reference below on the web.
The last number you quoted 348092 is probably the correct one for your R26 machine and the theory of a replacement engine and re-stamping of the frame and engine now seems more plausible.
The little singles were the workhorses of post-war Europe and gave the population cheap but effective transport. That said, a lot of them were worked to near destruction in the process.

In 1956 BMW introduced a completely revamped thumper, the R26 (engine numbers 340 001 – 370 236), with improvements paralleling those introduced at the same time in the boxer twins. The R26 came with an enclosed drive shaft, rear swingarm, and front Earles forks. A new headlight nacelle came with a sliding black plastic over the ignition key, and the “bell-bottom” front fender was dropped along with the mechanics' hand shifter. The engine of the R26 was bolted directly to the frame, and produced 15 hp (11 kW).

mtl66cars

Re: Help finding year and model of a Single

Postby mtl66cars » Sat Oct 31, 2015 11:35 pm

Any idea what year this R26 would be with this serial # 348092
Thanks for all your help

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Re: Help finding year and model of a Single

Postby boxerman » Sat Oct 31, 2015 11:51 pm

It will be somewhere between '56 and '60 and judging by the number somewhere in the earlier part of that but such info isn't freely available. I think the only way you'll find exact year of production would be to contact the BMW Factory Archive.
Phil Hawksley 'The Boxer Man' - aka 'Dangermouse'
Member #1 Much modified R80G/S - a REAL one
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