Re: Spark Plugs for 1990 Force 120
While there is clearance for regular bent electrode plugs, surface gap plugs are dead cold--both UL18V and L20V. I have seen the QL77 Evinrude plugs in Force engines--engines I have rebuilt for people. They are less prone to foul at idle speeds than surface gap plugs, but personally, I think you are begging for a melted piston or two by using "regular" plugs. One 120 I rebuilt had three surface gap plugs and one traditional plug. Guess which piston had melted. Right!
