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Irish R252
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Cork Ireland
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Posts: 7

So I have to admit I did the worst thing possible.
I bought a classic bike without knowing the the specs of the bike well and I bought it based on photos from a different country. (Germany)

I knew the seats and headlight weren't correct and negotiated the seller done based on that.

I've subsequently noticed that;
The rear light isn't correct.
The speedo isn't correct.
the gearbox doesn't have a handshift,
the tank doesn't have kneepads (I dont know if this means the tank isn't original or that the pads were removed).
The Brake and clutch levers aren't the right shape (not blades).
The exhaust is a torpedo instead of a swallow tail.
The pin striping is wrong.

So I have that slightly sick feeling commonly associated with the realisation that I was played for a fool.

Is there anything right about this bike, is there anything else I'm missing/ I'm essentially hoping the topend, bottom end, Frame, suspension and wheels are correct.

Cheers
Al

wa1nca
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VBMWMO #8374
Ashfield Ma.
Joined: 09/27/2012
Posts: 586
R25/2

Irish R252 wrote:

So I have to admit I did the worst thing possible.
I bought a classic bike without knowing the the specs of the bike well and I bought it based on photos from a different country. (Germany)

I knew the seats and headlight weren't correct and negotiated the seller done based on that.

I've subsequently noticed that;
The rear light isn't correct.
The speedo isn't correct.
the gearbox doesn't have a handshift,
the tank doesn't have kneepads (I dont know if this means the tank isn't original or that the pads were removed).
The Brake and clutch levers aren't the right shape (not blades).
The exhaust is a torpedo instead of a swallow tail.
The pin striping is wrong.

So I have that slightly sick feeling commonly associated with the realisation that I was played for a fool.

Is there anything right about this bike, is there anything else I'm missing/ I'm essentially hoping the topend, bottom end, Frame, suspension and wheels are correct.

Cheers
Al

Looks like the gearbox is from a R26
The front footpegs are not original
Do the frame engine and head badge match

You can send the info to bmw archive to see what they have on file
Just send them the frame # and engine # if different

info.grouparchiv@bmwgroup.com

Tommy Byrnes

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Tommy Byrnes
54 R51/3 55 R50 64 R27 68 R69US 68 Sears Allstate 250 (Puch)

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
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The handlebar risers on my

The handlebar risers on my bike are chromed but look the same as yours...I suppose they might have come in several surfaces. As for the transmission, my transmission has matching numbers to the engine case, so at some point, you would be able to verify that. I've seen some specifications that R24, R25, and R25/2 had hand shift levers, but was discontinued for the R25/3-on models.

I also notice that there's a rubber protector that's missing from the aft end of the Cardan shaft. It should sit right in front of the opening to the bell housing...it's there to protect from debris getting in. Mine is also missing, likely broke apart due to age. I've since cut a circle of plastic that snaps into the same place that acts as a deflector but probably not a good one. I did buy a new rubber piece but it has to be put on by disassembling the shaft and pressing it on. I intend to try cutting my new piece and gluing it in place...worth a shot to see if it holds. The rubber ring is pretty cheap...part number 33113038170 for about $10.

Does the rear fender have the hinge in it for removing the rear tire? Hard to tell, but it might be a different fender.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

Irish R252
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Cork Ireland
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Posts: 7
Thanks guys lots to figure

Thanks guys lots to figure out when the bike finally lands on irish shores. Being the technophobe I am I deleted my original post when trying to edit it.

Ah okay I thought the front footpegs just looked like that because they were missing their rubber.
Well spotted, the aft end cardan shaft rubber cap is indeed missing.

It feels like I'm playing and expensive game of spot the difference
Much appreciate the both of you taking the time to write a response.

Al.

wa1nca
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Ashfield Ma.
Joined: 09/27/2012
Posts: 586
Serial #'s

List of serial #'s from Bench Mark Works frame and engine #'s
Singles are at bottom of page

http://www.benchmarkworks.com/articles/tech/serial.html

Tommy

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Tommy Byrnes
54 R51/3 55 R50 64 R27 68 R69US 68 Sears Allstate 250 (Puch)

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6885
Additional info on any model

Additional info on any model can be found by searching the model by clicking on BMW Models on the left side of the screen. If you already know the engine number, type it in and search as well.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

Irish R252
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more questions

Thanks for your input so far.

Okay so the bike finally arrived this weekend and not as good as I hoped
as identified earlier, the gearbox is from an R26 or R27
In addition,
The engine is from a R25/3 attached to a R25/2 cylinder.
The Carburettor is a Bing 1/24/42 instead of a Bing 1/22/44.

I assume the r26 gearbox mated to the R25/3 engine isn't a big deal, am I correct?
Mixing and matching the R25/2 top and R25/3 bottom again I'm guessing is no big deal.

What about the Bing 1/24/42(R25/3) instead of a Bing 1/22/44 (R25/2). I know the airflow for the 25/3 came from the front of the bike, does this cause any problems.

The bike isn't running at the moment and I don't know when it did last, Petrol is leaking out of the carb.

Not sure what I've got myself into but Its essentially an R25/3 engine and carb with an r26 gearbox all in an R25/2 frame.
Is there any advice anyone can give me reagrding this setup. Like I said above my biggest worry is the Carb.

Just want to make sure I dont drive myself mad trying to make the impossible happen, a niggle at the back of my mind is guessing the reason it was sold non running is that whoever put these parts together couldn't get it to work properly.
Thanks
Al.

schrader7032
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San Antonio, TX
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Al -I would guess that the

Al -

I would guess that the top end/bottom end differences is not that big of a deal. Also I doubt there's any issue with a later transmission. I wonder with all the changes, what is the diameter of the cylinder like? Do you suppose it's been bored out once or twice??

You're right about the R25/3. The tank specifically had the air intake up front, routed to a collection box, and then into carb intake. Do you have the R25/3 tank or the R25/2 one? If you don't have the later tank, then you just have the carb sticking out the back of the head. Would be interesting to see what that setup looks like.

As for carb numbers, the R25/2 carb was a 22mm carb where as the R25/3 carb is a 24mm carb. Probably the fitment to the intake port of the head requires the right adapter to fit. Certainly, the internal settings on the R25/3 carb are different...you can see the differences here:

https://www.flickr.com/photos/roundel/66174400/

I'm sure it would all run, but you're going to have to tweak things to get the best performance. Like looking at the plug after a high speed run...see if the electrode looks right. I'm getting 60+/- mpg on my R25/2. With a bigger throated carb, you're probably going to be somewhat reduced.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

Irish R252
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Cork Ireland
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Posts: 7
Cheers Kurt, Yes I have the

Cheers Kurt,
Yes I have the R25/2 tank or something similar, it doesn't have the knee rubbers but looks the shape of one.
I'd love to know what all the changes was about, the dealer I bought it from in Germany is not very responsive.

I've attached some photos for you.
All the best Al.

  • 20191102_092732.jpg
  • 20191102_092717.jpg
  • 20191102_092641.jpg
  • 20191102_092634.jpg
schrader7032
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San Antonio, TX
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Al -Well, certainly the carb

Al -

Well, certainly the carb looks a little different. Plus the "rock strainer" of an air cleaner looks different as well. Here's one picture of mine 1/22/44. But it will probably all work, but as I said, will take some work getting it to all work together.

I had to look up where County Cork is. My roots seem to go through County Clare. One of these days, I hope to make it there!

  • carb.jpg
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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

Irish R252
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Cork Ireland
Joined: 10/26/2019
Posts: 7
Oh let me know if you do make

Oh let me know if you do make it over, I'll show you my R25/2/3/26 hybrid Smile
Don from the other R25/2 manual post is from up your way in Clare, its the nicest part of Ireland,, after Cork Wink

Thanks for posting the photo, yes plenty different indeed.

Hopefully all will end well.
Al.

wa1nca
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Ashfield Ma.
Joined: 09/27/2012
Posts: 586
R25/2/3/with a R26 transmission

Model Engine numbers Vehicle ID numbers

R 25 (1950-1951) 220001-243410 220001-243410
R 25/2 (1951-1953) 245000-283650 245000-283650
R 25/3 (1953-1956) 284001-331705 284001-331705
R 26 (1956-1960) 340001-370242 340001-370242
R 27 (1960-1966) 372001-387566 372001-387566

Where does your engine # read on this chart

Yea would also like to visit Ireland

Tommy Byrnes

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Tommy Byrnes
54 R51/3 55 R50 64 R27 68 R69US 68 Sears Allstate 250 (Puch)

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