The Bing carburetors used on the R51/3 to R69S models came with 3 different flanges.

We sometimes get the question: can I put carburetor X on BMW model Y?

In theory you can put an R51/3 carburetor on a R69 engine and even get the engine running,┬ábut you will quickly discover that the air pipes won’t fit.

These images are self explanatory

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