Last week I had put up a post about my Merc. 7.5 hp having troubles starting. The motor runs great when I get it going, but have a hell of a time getting the thing started. The only way I can get it started is by tilting the motor out of the water and pulling it about 15 times or to put wd-40 in the cylinders. I've done a little research and believe I've been using the wrong spark plugs. I've been using a champion L78v plug when I think I should be using a Champion L77v plug. Does anyone know the difference in these two plugs? Could this be my starting Problem? The l78v is a no gap plug. Any help would be appreciated.