The engine series on your mower is no longer made due to emission regulations. With the model, type and code numbers from your engine, stamped into the blower housing, a suitable replacement should be available.

These mowers had the big block series of B&S engines. They have been obsoleted by the EPA mandated junk. You can get parts to rebuild the original engine. You might want to check with Small Engine Warehouse or Tulsa Engine Warehouse to be sure.

I think the Harbor Freight engines will not have the torque needed to run this mower.

Here is a link that might be useful: SEW Web Site