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Author Topic: Stihl Yard Boss MM55 Carb  (Read 913 times)

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Offline 660magnum

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Re: Stihl Yard Boss MM55 Carb
« on: April 07, 2016, 05:00:10 pm »
The vent you are talking about just connects to inside the air filter. Normally there is just a hole in the carburetor cover for this function.

If the regulator diaphragm vent hole gets plugged, the engine will stop. A rotor tiller works in such a dusty environment at times, this was added for reliability. Some Stihl chainsaws have this.

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