O.S. 91HZ-R Conversion Set (72512000)

This is the O.S. 91HZ-R Conversion Set and is intended for use with the OS 91HZ and 91HZ-PS engines. This set provides you with the parts necessary to convert an existing O.S. .91HZ or .91HZ-PS engine to the newer fuel pressure regulated .91HZ-R version 61E-R carburetor. This system pressurizes the fuel delivery system, allowing for a more reliable, and more powerful setup. Also, a pressurized fuel system helps to prevent the fuel magnet and fuel line from getting corroded by the dirty exhaust gasses, which is a problem found in systems that use muffler pressure.