I don´t think the R1 and the Honda engines are the best examples, since it´s cranks and rods are set on metal bushings( I think it´s the term) which clearences are filed whit oil on an higher pressurised oil pump, plus, being 4 cilinder engines makes the crank more balanced due to the firing order, opposite to the big stroke on the thumper on just one bearing.but then, it´s just my thought:excuseme:
The oil pressure is not really any higher within the system, only at the bearing, since rolling element bearings cannot hold any oil pressure. On the other hand, they don't need the pressure, either, and don't even need the volume of oil they get. Look how long the big end in a two stroke holds up on not much more than the smell of oil in the gas.
not exactly flattrack, but supermoto.
maybe i´m riding on a bit stessing conditions and you guys are not so much...
could also help if you tell me how do you ride.
Fast trail rides, MX, desert, flat track when I can find it. Let me know if you think that running down a graded access road at 7-8000 grand for ten minutes at a time isn't stressful for a rod bearing.