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I have a Craftsman rider with a Briggs 31c700 series 16hp I/C with the nikki carb. It will start up fine. and run for about 10 minutes sputter then stall. It will restart and run for a couple of minutes then sputter and stall.
If I remove the air cleaner cover and choke it with my hand it will start and run for 5-10 minutes before stalling again. I have tried 3 different coils so electrical problem is unlikely,
I have also removed and cleaned the gas tank, replaced all fuel hose as well as fuel filterals o cleaned carb with cleaner.So folks what am I missing? Thanks Rick

Two things I can think of. One, if you have a fuel pump, the pulse line may have a crack in it that as it gets warmer opens not allowing it to pump properly. Two, I would remove the carb and either let it soak in carb cleaner over night or have it ultrasonically cleaned.

Rivets said:

Two things I can think of. One, if you have a fuel pump, the pulse line may have a crack in it that as it gets warmer opens not allowing it to pump properly. Two, I would remove the carb and either let it soak in carb cleaner over night or have it ultrasonically cleaned.

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Thanks Rivets
I will give it a bath overnight and see what happens.