I've got a couple of used self propelled mowers with the same GVC 160 engine. One is a Harmony and the other a Sears. The Harmony was running when purchased, cost $75 and came complete with the rear bag. The Sears was not running but cost $25. I bought inexpensive Amazon sourced carburetors...
I've got a Harmony II SDA (HRR216SDA) with GCV160 engine. Does anyone know whether there should be a paper gasket on the side of the aircleaner housing facing the engine?