A=port to oil sump-this is used for the bypass style oil filter
B=oil pump output-directly above B port is the pin that you have to drive in to block the internal passage, thus directing all the oil pump's output to this port
C=plug for water jacket-I'm not sure what it is for
D=drain plug for water jacket
E=oil galley inlet port--oil leaving port B goes into a full flow oil filter-the filtered oil leaves the filter and enters the engine's oil galley at this point
F=side motor mount bosses
G=not sure
H=this is where the throttle linkage pivots. A special bolt screws into this hole and allows a stamped steel pivot to transfer movement from the gopedal to the carb.
