I can see how the pcv could cause better ring seating and braking with the engine because the vacuum created by the pcv, better gas mileage and less oil burning...seems it would be the opposite making the engine work harder and pulling more oil up on the cylinder wall. Maybe the valve timing is enough to to eliminate the vacuum created, if so that would end the better ring sealing which was the purpose of the mod to start with. After seeing that small hole in the airbox where the vent hose is connected caused me to rethink this mod and the reason Kaw did it this way. Maybe it works for some oil burning engines? Give it a try tell us how it works for your bike.
Some things you do not question. How long before i get banned here?
Actually, Drifter, in actual tests, no vacuum has ever been measured in the crankcase of a KLR650 engine with PCV Mod installed; whether spring-and-ball valve or vane-type, no vacuum. Rather, an over-pressure (compared to atmospheric) exists in the running engine's crankcase . . .
Nevertheless, the operational enhancements mentioned (i.e., more power, better fuel mileage, lower oil consumption, improved engine compression braking, enhanced ring sealing) have been reported by users firmly convinced of these benefits.
I think the reasons Kawasaki "did it this way" (i.e., valveless vent hose to atmospheric pressure side of air box) was: 1. Engine as-built passes current emission standards, and 2. Intake backfire dynamics adequately managed by baffle arrangement (a major function of a "real" PCV valve in an automobile is preventing intake backfire flame from entering crankcase, where combustible mixture may exist). DISCLAIMER: Conjecture on my part; don't know why Kawasaki, "did it this way!"
Fear not banning for expressing your opinions, generally, on this website; or . . . even for questioning concepts . . . depending somewhat, perhaps, on the mood/attitude of the moderator poised over the banning button!