Reading this forum and other HD Tech forums reveals that there are many compensator and inner primary bearing/races issues. Plus the fluid of choice in the primary may or may not cause some of the issues.

The ATF crowd (me included) see better shifting and no slipping of the clutch. The oil crowd says that oil or HD primary+ fluid gives the components better lubrication and longer life.

Does oil in the primary make the chain last longer, lubricate the bearings more, stop the rusting on the comp shaft????

Also, the fill point of the primary is at the bottom of the clutch pak. That being said, the only lube reaching the bearings and comp shaft is from it flinging up into those areas while the bike is in motion, correct? If that's the case, you would think thinner fluid would do a better job, or not!

I know nothings going to fix cheap '***** bearings but I'm sure there are many bikes out there with many miles on them that have no comp or bearing issues.

I was already to make the grooves on the comp sprocket until I read some of the later post on the tolerances that allowed fluid to the areas in question.

What we should do is request a survey of the riders who have had inner primary bearing issues and find out what fluid they have used up to the point of failure.

I would guess that many/most of them have used the HD primary fluid up to the point of failure.

 

Comp, clutch, and bearing replaced last month, I was using Amsoil ATF from the 1,000 mile service up to the 20,000 mile service, when I changed to Drag Specialties Primary Fluid. The DS fluid gives me far superior clutch engagement compared to the Amsoil. Oddly, the Amsoil works better in the Night Train with a S/E 6-speed and Barnett clutch.

 

Replaced Main Drive Gear bearing at 45k, and while I was there I replaced the IPB with the Baker High Torque. However the IPB and Inner Race were in perfect shape. I replaced them for the ease of the Baker slip fit.
Used HD Formula + almost exclusively. I did experiment with B&M trick shift (dino and syn) for a couple hundred miles though.

 

IPB failed at 37,000 miles. I used 10w40 motor oil in the primary. Have been using HD formula+ since. The dealer used the formula+ when they changed the IPB and then I had comp issues. When comp was replaced, the dealer used formula+ again. I haven't had to change primary oil for a while. I don't know what I'll use when I do.