I have a couple of mid 80's vinatage johnson kickers (6 &2) that the owners manual sais to use 100:1 mix in. Have read I can to use 50:1 or more. Does this ( 50:1) effect how the motor runs? Mine seem to smoke ALLOT more than their Merc counterparts that are designed to run 50:1. ( Especially the 2 hp) .