As soon as it leaves your driveway you can go to the ministry and take it out of your name. I think at no cost.I normally certify the bike I am selling. I have a mechanic that I always deal with, which makes it easy for me.
I usually list the bike as "certified at this price" If the guy wants to negotiate below my asking price, I will say $$ but you certify.
The main reason I want to certify it, it makes it easy for the buyer the "get it out of my name"
We have all sold bikes and weeks or months later the buyer still has not changed the ownership.