you need to find out what kinda gap the motor requires I guess. then use a gapper and gap them to spec. I always buy my plugs at clemens marina so i get the ones for the motor. been 3 different kinda plugs for the 4 outboards i have had. same one both 15's. call your local boat/outboard dealer/parts store. you would be suprised how much they know about these kinda things and then you can get the parts you need from them.
didn't get to the boat shop. My work wont let me return the others but i got them exchanged for the same ones i was looking for originally. Come to find out they are a. 05 gap. What effects would it have running those with a motor that wants a. 030. Should i just buy the gappable ones from the boat shop and use theses.as spare
I don't think i've ever had an outboard motor plug i gapped at 05
My Sea King motor i gap at .030
It hasn't always been a Champion plug. Sometimes i've gotten NGK or others, but i've gapped them all the same over the years, at .030
ussually the ones that you buy at the boat shop will be gapped to what you need already. your work doesn't sell plugs that are gapped to what you need? couldn't you just get plugs and gap them yourself from your work? and were do you work that doesn't allow returns?
Lat year I went went through my Evinrude '64 9.5 hp kicker. Along with the carb rebuild and new points and condensers, I went with E3 spark plugs Spark Plugs | Automotive Spark Plug | Motorcycle Spark Plugs | E3 Performance Spark Plugs. I will never go back to standard style plugs again. It's been a one pull start every time since the plug swap and the low idle runs smoother than I'd anticipated.