Small Engine Troubleshooting Problems? Ask a Mechanic Now.
The head bolts are the studs that run from the case, through the cylinder and through the cylinder head, It uses a gasket at the case and the head gasket. There is not a known problem, but you could remove the rocker cover and check to see that the 4 nuts for the studs. If it still leaks, the gasket at the case would need to be replaced. But that would require removing the head and cylinder, and piston from cylinder.