Taking my new/used 1979 Evinrude 15 two-stroke out for the 1st time to troll for Kokanee & Eagle Lake strain Rainbows this weekend. Plug # on the boot is L78V and am running a 50:1 mixture - will this plug do for slow 1 - 2 mph trolling or will I be fouling plugs? What is the next hotter heat range plug I might consider?PS - lake elavation is approx. 500' above sea level.
You can switch to a QL77JC4 and gap it at 0.040" for less chance of fouling at slow speeds. The L78V is a surface gap plug. I'm not a big fan of that style plug, but it is an option that is supposed to be "low fouling", but I've had better results with a st'd electrode plug. Why not compare and let us know.Good luck