I am converting my 74 H2B to the early 3 line system.........the 3 into 1 line is goofy and probably starves the far cylinder to some degree, the 72/3 system has nice large individual lines feeding each main bearing with the rebuildable brass check valves
Its easy to put the .030 Mikuni jets in the late cylinders, then you have to drill the passage in the cases (properly, come out near the top), get an old style pump and lines
I don't know about the argument of atomizig oil in the carbs as the late model does, or just feeding it into the port as the early system does........the late system changes your jetting (leaner) as it has a percentage of oil mixed with gas
Now are people running around with late model engine failures due to oiling, I don't think so.......I had the parts and I am doing a major rebuild, so why not convert it since it's all apart......otherwise I probably would have left it alone
This is the Darth-CrabbySteve 3 into 1 line (nice product) vs the early system
THX Phil