If you are thinking of buying this carburetor vs. some other carburetor I had the same thing only I once bought a much more expensive one and a much cheaper one which eventually led me to this carburetor, it's well-fitted and works well on a Yamaha DT 125 (where the original was probably 26mm)
I recommend ;)
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Reliable opinion
Schmitt - Motorcycle carburettors to the most popular motorcycles