His problem isn't wet sumping.Oh yeah, like REpozer said, don't try to keep it higher than half full on the dipstick. It just spits the oil out.
PS just read this last response... I got rid of my stock catch can initially with the desire to strip down and simplify my bike. I got rid of the stock airbox, so it seemed natural to do something with the catch can since it no longer had a place to go, and I was experiencing wetness in the stock airbox.Cheers,Chuck
Mine blew oil into the airbox ONCE (spring of 2011, bike was brand new) soaked the air filter & dripped through the hinge & all over the giant muffler & the rear of the bike. I immediately tore all the hoses & cans & tubes off, put & K&N filter right on the carb & rerouted the CC breather hose into the empty air filter case as I've talked about here before. Zero problems since then. No oil spewing anywhere. At most I get a slight oil mist out of the duckbill. I haven't even had to change the old pair of underwear I stuck in there; not a skidmark on them For me simplicity is always the goal. I'm gonna work on a battery inside that right side case next & do away with that huge battery & the holder & everything. I don't like the way the battery cover fits & it hurts my hands getting it off & back on. Besides, I never use the starter & never ride at night. The battery in the harley is 1/2 the size of the RE battery.