06-06-2018, 07:46 AM
Radial, not axial Bob - but basically correct. At least that's the theory, but crankshaft whip among other things clouds the picture slightly. There's quite a bit on alternative bearing configurations in the 750 companion. Two rollers would have little capacity to support end load. A pair of self-aligning ball races can and indeed does replace the ball and roller set up successfully as they are designed to take both axial and radial loads (also a degree of misalignment which a roller race can't handle so well). n.b. It's rather early in the morning so I'll probably realise I've written something stupid later...