Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Does it have spark when it quits?
No spark when hot,will be badcoil.
If it has spark, is the fuel tank venting?
Is engine equipped with oil pressure cutoff switch?
Remove the oil pressure switch wire and see if engine will keep running.
At the oil cut off switch.
Near the oil filter.
# ***** is oil alert.
Revving up and down would seem to be a lack of fuel, and not the coil!
When coil quits, engine would die and not restart till it cooled off.
Have you cleaned the carburetor.