Your engine is a BRIGGS, MODEL NO. 287707-1255-E1
It is an overhead valve engine. If the valves have gone out
of adjustment it won't run.
With the piston 1/4" past Top Dead Center the clearences should be. Intake .003-.005" Exhaust .005-.007"
If you have spark and fuel you should get something!
Are you sure the flywheel key has not sheared?
Rick
August 2006