Gamefisher 35hp outboard NEED HELP

[chris doe]

i have an early 80's model

i have an early 80's model 3.5 gamefisher outboard. it was given to me without a spark plug. any ideas of how to find out what size plug should be in it?

 

[Jay Carlberg]

Most of these have a Champion

Most of these have a Champion RJ-13-Y