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 spent a lot of time on this lean surge problem on my Craftsman with Honda engiine. Did a lot of carb and gasket swapping. I had two used Honda GCV160 carbs to play around with along with an Amazon Panari carb. One observation is the choke valve on the Honda carb isn't designed to fully...
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?