This is just an opinion, I wish nothing but the best for all riders, and I "DONT" claim to be the ultimate authority. This is not an attack on Newultraclassic, so please don't take it that way. You quoted me, so I am answering you, only for that reason. You said it yourself, can leak out the mainshaft seal. If you have not pinched off your vent hose and done a vacume test on your bike while running, then you really cannot say its not venting. If you indeed have one of the few systems out there that is performing as the factory intended it to, thats great. It would have basically no oil in the primary except to oil the primary chain. The reason I/we mentioned venting is most people who run different clutches run more oil in the primary. Your clutches although stated to be dry, are really not totally, as you know if you have had them in for so long and oil soaked. Most of the people with your type of systems don't understand how they work. And why the primary needs to be sealed so it can scavenge the oil to keep the so called dry clutches dry. Real dry clutches such as in a 66 sportster have a gasket and cover to seal them. As for the age of these systems, most have long been changed, even the factory changed them. Out of the existing systems, most are not maintained properly because of lack of knowledge, warped parts, bad seals etc. If you know of these systems, and it sounds like you do, consider yourself a knowledgeable harley guy. But most people really dont. Lots of people just vent the primary, raise the oil level and change the clutches to wet/dry ones. Anyway, I still appreciate your and everyones input, and I hope they appreciate mine, so again please except this as just a discussion, no negative connotations are meant or implied.