I removed the oil rings from some new Mahle pistons I used in my 28 Indian 101. With the rings too much oil built up in the crankcase and the bike overheated. Now it runs really well and uses about 1 quart per 150 miles which is apparently perfect for this type of oiling system.
My theory is like a 2 stroke, total loss oiling needs to consume oil, I have also heard of some people using 2 stoke oil in vintage machines. I use monograde 50 weight. Done about 5000 miles and all seems good.
'36 four. '44 Chief & sidecar. '28 Scout. '67 XLCH. '70 BSA. and a Guzzi...............