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The spring of the main membrane of the carburetor is Keihin CVK 32 and in some cases CVK 30 also.
The spring works in a membrane and eventually loses its properties, needs to be replaced.
If the carburettor consists of several pieces (2-3-4) - the spring replacement should be for all carburettors.
Springs can not be stretched or cropped - efforts have nominal value, which can not be changed without testing complex equipment.