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On the proddy bikes, yes, about the same time, because the later 4 outlet oil pumps literally made the oiling system a premix one, by dumping the oil into the fuel in the bowls. Yes, the left main/rod system was still there, but it never did contribute much to the oiling system.
What some just don't see is that the bottom of the cylinder end banjo bolt has one restriction, for the main/rod, and the cylinder has the other restriction for the inlet port, on the 3 line systems.
The 4 line systems had different metering into the float bowls for the premix addition to that system. Many have simply drilled and tapped a side boss that dumps the oil into the slide area of bigger carbs, but the correct way to have done it is to use the stand pipe and bowl boss, like the stocker carbs had.
Sure, the argument can be made that the oil line into the idle screw boss works just fine, but, that does not make the system work as the correct premix system it was designed to be.
Although I like the 3 line systems best, the 4 line premix systems do work better when the oil is added to the fuel in the bowl. The slotted rods helped get that premix into the big end bearings a lot better than the non-slotted ones did.
If one has seen both H1R and H2R rods, they are slotted, always were, even when the proddy rods weren't, because they worked a lot better with the simple 3 lines to the lower end, premix in the bowls oiling systems used on the race engines. Every H2R crank we ever used, had the oil receivers in place from the factory, and we never saw any reason to leave them off, especially the myth that they added significant drag to the cranks, they just plain never did.
Me, if it is a two stroke, or even a centrifugal spin lower end 4 steroke like the Z1 and KZ900/1000/1100 engines, slotted rods are just the way to go.
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