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Thread: Need help with a 1958 R26!

  1. #1

    Exclamation Need help with a 1958 R26!

    Hey everyone,
    Writing here because I bought an Dove white R26 last summer and was starting to work on it. While the bike runs, I immediately ran into some issues. When looking at the carburetor I saw the previous owner had slapped a Mikuni carburetor on, which the flange was hammered on just to get it to fit. So I went forward and purchased a rebuilt Bing 1/26/46 carburetor from Germany. However once I mounted that it started leaking fuel everywhere so I have to tinker with it. So I have questions for the forum....
    -Does anyone know what model number Mikuni fits these model BMWs because Id like to try fitting it. I find that many of the models do not have the right size to fit as an exact replacement to OEM carbs.

    P.S. I am not a professional mechanic, Im just an average joe with interest in these beautiful vintage BMW bikes.


    Heres a pic of the beauty:
    IMG_8275.JPG

  2. #2
    Liaison 20774's Avatar
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    Welcome to the forum! I can appreciate the singles...that's a nice Dover White version. I would think that the Bing can work just fine but there could be issues with the replacement Bing. Might be that the float doesn't work right? Is it brass? Brass will stress-crack for no reason at all...when it does it fills with gas and sinks. Is it possible for you to take pictures of the current Mikuni setup installed as well as a picture of the flange on the head? The BMW head on the singles, as least on my R25/2, have two bolts horizontally which mate with the flange on the carb side. What is your setup? I thought that the flange on the Mikunis had holes top and bottom. One needs an adapter in that case.

    There have been some discussions in the past about Mikunis but generally for the twins however some for the singles. Here are those threads.

    https://forums.bmwmoa.org/showthread...ni-Carburetors
    https://forums.bmwmoa.org/showthread...buretor-(1964)

    I'd dig deeper into the issue with the Bing before jumping in the Mikuni world. The 1/26/46 carb number indicates that the carb opening to the head is 26mm, so you would need a Mikuni to work with that. Rocky Point Cycle is someplace that does support Mikuni carbs...maybe they can help.

    https://www.rockypointcycle.com/c-bmw.html

    In a little bit of time, we're going to have to change your forum username once you get this bike figured out!
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  3. #3
    Hey,
    So I do not have pictures if the Mikuni mounted because I currently have the carb dismounted off the bike and its cold in Jersey so everything is put away. Here are pictures of the mikuni so you can see the flange and how it was hammered to shorten it to fit the space. I would really like to know what model number this carb is but there is no indication on it. Also the bing is brass so Im sure its a float issue but I would rather have someone who knows more about it look at it.IMG_5367.jpgIMG_5366.jpgIMG_5364.jpg

  4. #4
    Liaison 20774's Avatar
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    I have little to no experience with Mikunis...I don't understand why the mangled end, which I assume was supposed to be connected to the head intake port. I'd be interested in seeing what the aft side of the intake of the head looks like. Hopefully no damage was done to that.

    Maybe other's with good eyes can identify the type of carb. I would also check with Rocky Point...maybe they could look at a picture that you send them to get a better sense of what model the Mikuni is...or recommend one that might work in your situation.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

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