B&S single cylinder 14hp OHV valve problem.

Could it be a failed cam-mounted decompression mechanism that is used on some B&S engines? Symptoms sound similar to engines with this common problem.
 
Briggs 14hp OHV would a 280000 series . IN 003-005 EX .005-.007 Jam Nut or set screw 45 lb-in. (5 Nm)
 
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