Unless your sparkplug wire has been changed to a push on connector, your going to need a sparkplug with the screw type connection. These are getting harder to find. I have been using the champion J-17-LM in my Cubs, and my other small motors, for quite some time. However the ones I bought to have for spares to bring on vacation, no longer have the screw type connection. If your plug wire does have a push on connection, or you should want to change it to one, I suggest using the J-17-LM.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.