I agree that we haven't seen much of the small pushrod Briggs engines yet, Peter. People seem to like them when they are new, but we have yet to see what a few years do to them.
At least one type of chonda engine uses a flexible rubber-like plastic flap valve for a PCV valve instead of a rigid plastic disk like the other chondas. There have also been quite a few chondas that have been used for years without an oil change, and they ended up with blockages in the PCV compartment. I'll be interested to hear more about PCV issues, and in particular about the reliability of the flap valves in older chondas. I've seen some very worn and sad genuine Hondas, always with disk PCV valves, and I haven't yet seen a stuck or blocked one. (I have seen them with the disk valve pretty much worn through, though.)
