i recently purchased a 1984 yamaha 40 h.p. enduro outboard and i have a few questions--1st what is the correct gas/oil mixture?? 2nd on the lower unit there are 4 "plugs" 2 for the lube drain/fill and 2 for a wash (apparently this was a salt water motor and i assume they are to flush any salt water out)There are 2 small 1/16-1/8 holes on the case that lube weeps out on occasion--what are they?? i have had a few other outboards and they did not have these.