Briggs and Stratton quits after 20 minutes

Wfmnash

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May 27, 2014
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I have a Briggs and Stratton 18.5 with a Nikki Carb. Mower runs great for 20 minutes then shuts off. If I turn key completely off it will start back up, but when engaging blade it stalls out. I have cleaned carb, checked the solenoid, but not sure if the rubber tip should be lose. I recently replaced battery, starter and solenoid near the battery. Checked values and gas cap. What else could be the problem?
 
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