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My 2012 Toro model 20334 mower was sea water damaged in Hurricane Sandy last year. I removed and cleaned the Briggs 794304 carb and noticed that the throttle valve does not move freely like the choke valve does. It actually clicks when I turn it. One mechanic told me the valve should turn freely so the linkage can change the throttle position and another told me that these newer engines are designed to operate at a single speed.

I put the carb back on with the valve "clicked into" the 1/2 open position and the mower starts up on the first pull. If I change the position of the throttle valve by "clicking" it open or closed the engine increases or decreases in RPM.

My question is does anyone know for certain how this throttle valve should operate? Is it supposed to click into a position so that the RPM can be set at a constant speed or should it move freely so the linkage can move the valve to vary the RPM? I'm fortunate that I was able to salvage the mower but I don't want it to run hot unnecessarily if the valve should be controlled by the linkage.

Thanks in advance.

Both mechanics are correct. It is NOT supposed to click. It should move freely, but with that being said, the engine should only run at governed top speed. The governor needs the trottle to move freely to maintain governed top speed under different load levels.

Rivets said:

Both mechanics are correct. It is NOT supposed to click. It should move freely, but with that being said, the engine should only run at governed top speed. The governor needs the trottle to move freely to maintain governed top speed under different load levels.

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Thanks Rivets for the quick response and clarification.