Geez, If you think that was a smart ass remark you haven't heard nothing yet. I have no opinions here just facts. We are not talking Evo or Twinkie. We are talking about a pan lower end with a tin primary. All 4 speed bikes up to '84 had a dry clutch. The primaries were not filled with oil. If you tried to fill a tin primary with oil it would just run right out on the floor. It was not the greatest set up because of the presence of oil used to lube the chain which eventually got on the clutch plates and part of your routine maintenance was to remove the plates and clean them. The oil pump added oil to the breather which blew it on the chain. Then the oil was slung off the chain where it ran to the bottom of the primary and out on the ground. Read constant loss primary. In '65 they started with the aluminum primary that was sealed and the oil was sucked back into the motor using crankcase vacuum. If you filled that one with oil, which is happening alot these days at harley dealers, it would suck the oil back to the motor, pump it to the oil tank till the tank was full and then blow the rest out the breather. Granted a belt primary is not the greatest set up but is 100 times better than the original set up on the early tin primary bikes only and I do recommend obtaining a spare belt when you purchase the drive just because the correct belt is not easy to find should you need one far from home. The big advantage you have with the '64 and earlier bikes is the ability to move the trans to align and tension the belt correctly and if done right and mantained you will get many miles from your belt with out all the oil mess and constant chain adjustments. Now, yes the 3" open belt is a tougher set up but will not fit in the tin primary if you are trying to mantain a stock look. It also needs to be kept clean so abrasive road dirt doesn't eat the belt and pulleys up, which is not a problem for people who are anal about such things, and the sealed bearing on the hub does eventually give up. The 1 1/2 belt in a aluminum priimary has a short life due to the excessive heat held in the aluminum and the inabilty to adjust belt tension and alignment. Venting helps a little, but not much.
100thevo, I should not have used the word tamer, the correct term is clutch hub retainer. It is a piece of delrin plastic that slides on your ten stud hub and replaces the tin piece that holds your bearing in place. It has a larger outside diameter and bears against the basket keeping it from sliding out when the clutch is released.
Springer, I maybe a smartass but I'm a smartass with 40 years of riding and wrenching Harleys under my belt, National records from the AHDRA hanging on the wall, 25 years in business for myself rebuiding all years harley motors and a strong desire to ride right into my grave.