B&S engine, intermittent problems.

[MEBrown4760]

Replaced governor spring thinking that would fix it. Carb is new. Has gas in the tank and the line is clear. Normally it starts fine. After I shut it off and go back to restart it is when it really gives me trouble.
Now when I start it it just revs up and down and eventually sputters out. I tried to upload a video but the files are too large. Even 3 seconds of footage.
Thanks.

 

[Rivets]

What were you originally trying to fix. Post all engine numbers so we have an idea what you have.

 

[MEBrown4760]

What were you originally trying to fix. Post all engine numbers so we have an idea what you have.

Sorry for the lack of details. This is a Sears Craftsman mower, model number 917.387620.
the engine is B&S # 12H802-2684. I’m trying to solve the problem of it not running consistently. It seems to start ok when it’s cold. If I don’t shut it off it goes till the fuel runs out. When I go to restart it it doesn’t want to start again. Now it will start but but wants to surge back and forth. One post I saw suggested water in the fuel as a possibility. I’m about to go check that out.

 

[Rivets]

More than likely you are going to have to clean the carb, as it sounds like a lean fuel condition.