Well, I got my stock clutch kit (Yamaha 4WM-W001G-00) and my Barnett spring conversion set.
In talking with Barnett, I decided to go with the standard Barnett springs, as that is what they recommended for a non-race cruiser.
I also asked them about the bearing issue. Their reply wast that they "have had a few, but they were all high mileage bikes." This was by email so I did not get to clarify if the meant the Barnett had high miles on it, or just the bike.
After watching a few videos on our specific clutch, I feel I now have a much better understanding as to the bearing.
It becomes easy to see how improper clutch cable settings could be very detrimental to the bearing. Too loose, and the pull will start to angle which will put uneven pressure on the bearing causing it to spin constantly (under an uneven load.) Too tight and the bearing will be under a constant side load which will cause wear much quicker.
I can see where the angular bearing "could" potentially be better, but there were other questions / issues that concern me as to the use of the angular bearing.
1. The Specs on the angular state a max RPM
of 20K. If the pull and cable are adjusted properly, and the bearing and plate are not angled in any way, that shouldn't be a problem. My concern would be that any misalignment of the plate or bearing could push the bearings RPM near or up to the max. In general, mechanical designers then to spec components such that they are expected to see no more that 60-70 percent max load under peak performance. The angular is nowhere near that.
2. Since the Yamaha is listed only under a Yamaha part number, I can't find and specs on the bearing, so it could be 100% stronger (or weaker.)
Since Barnett said the bearing they use IS the same one from Yamaha (I didn't understand if they buy them from Yamaha, or they know the "aftermarket" part number) and the stock Barnett springs are only 20-25% STRONGER than the Yamaha spring plate, I'm going to stick with the standard bearing. I think if I was going to do the HD springs, I would give more serious thought to the angular bearing.