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After 3 years, the tap of the Oka MB1 walk-behind tractor started leaking. To replace the tap, you need to change the entire carburetor, since the tap is made in one housing with the carburetor. In this video, I show my personal experience. As a result, I did a lot: I disassembled and lubricated the gas control unit, found an extra part there, removed the gas tank, figured out the automatic increase in gas with a centrifugal speed regulator, found the differences between the new and old carburetor. As a result, I ran in the walk-behind tractor with a new carburetor.