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I answered my first question myself. Upon looking at both valve stems, I realized that the new stems were designed for the new half keepers and not for the old style keepers. I had to pull the head, lap in the new valves, install the new stronger springs, spring washers and new retainers. The...

I have a generac 4000xl generator model 09777-2 I bought in 2000, with a B&S engine Model GN220 and broke a valve spring retainer part a1720. It was replaced with a kit with springs, valves, valve spring retainer, oil seals, head gasket and the half clip retainers (Generac part # 0D24890ESV). My...