Early Sportster Primary Drive

First, I installed the kicker shaft and gear.  The new "square style" black rubber kicker shaft seals are too tight and too square.  You can easily cut the seal when installing the shaft.  I turn the seal inside-out and bevel the sharp edge, so it doesn't get cut upon installation.  Grease it up good, don't forget the thrust washer (with flat side up).  New seal in the clutch basket, and lithium grease on the needle bearing.  It still had the original-style brass clutch hub nut lock (which kinda serves as a seal too).  The lock was in good shape, so I reused it.  Heavy washers under the adjuster bolt heads.  Now, it has the correct chain tensioner with NOS shoe and retainer.  My last one.  I installed the whole business with original, factory dealership issued Harley-Davidson tools - ie: gear locks, and hub to basket lock. I tightened everything by hand to facilitate removal "on the road."  No air impacts.  It's the way our H-D founders intended.

The Diamond brand primary chain is a good choice.  I also like the Tsubaki chain.  Do yourself a favor and stay away from all the other ones.