Re: Freeze Plug # on my 70 (FINALLY)
As I said before, your motor is either 1989 or 1990. Can't tell for sure without the model number because they look alike and the cover has been redone.
I based that on specific factory components of the motor that show in your photographs that either did not exist on earlier models, or are components that were only used for a short time during specific years.
If you know a BRP dealer well enough, she might contact BRP and see if they will look up the serial number for you.