OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Briggs & Stratton Engines 10.5hp runs rough

Hi dexter

Check the head bolts aren't loose and the head gasket is still sealing.

I would check the valve clearances ,possibly when the motor is hot the exhaust stem has expanded and clearance is lost
causing the valve to be open.

https://outdoorpowerinfo.com/engine_specs/briggs_valve_gaps.asp



Cheers
Max.