os speed rod oil slot
#2
Oil hole faces the crank. Always.
#4
Forward, towards the carb.
#6
Some rods have a slot on both sides but the hole is only on one side.
Another way to tell is to look closely at the lower bushing. One side of the bushing has a nice rounded chamfer, the other does not. Rounded side ALWAYS goes against the crank with the un-rounded side against the rear cover.