Post all engine numbers including code: model xxxxxx, type xxxx, trim xx & code. Are you using B&S OEM part? Not aftermarket? Also clean engine by hand with shop rags or towels, I prefer using a shop vac after loosening everything up, crud, dirt, etc. Also check air filter for replacement as well as changing oil & filter if oil is black. Make sure underside of flywheel is clean & nothing stuck to magnets.