Forgot to mention, I'm speaking from an Ontario perspective. For reference:
Know the steps you need to take to buy or sell a used vehicle in Ontario.
www.ontario.ca
This is what Service Ontario requires from you to transfer the ownership to your name:
1. Vehicle permit (aka ownership) with the completed Application for Transfer portion on the back and signed by the currently registered owner
2. UVIP
3. Bill of sale (either use the template included with UVIP, or make standalone one - see below)
4. Driver's license (for identification purposes, not sure what else is accepted)
5. $32 fee for printing out a new vehicle permit
6. Taxes on the purchase price shown on the bill of sale (currently HST); UVIP for motorcycles don't currently show a wholesale value
As mentioned, the seller is supposed to provide the UVIP so you can review the history, branding, and lien status BEFORE you decide to buy. It also has a bill of sale section that's normally used to keep it all together. If for some reason you decide to buy the bike without the UVIP (I wouldn't except in very special circumstances such as a parts or track bike), you can get one yourself either online (delivered by mail) or in person at Service Ontario, and you can actually get it at the same time you go to transfer ownership. Just beware that if it shows a problem, you may not be able to register (if there's a lien) and/or plate it later (if it's branded). If the UVIP is clear, then you'll get a new vehicle permit printed out with your name as the registered owner, and marked "unfit" (which just means it hasn't passed a safety inspection and therefore can't be plated until done).
This is what they additionally require from you to plate the bike, either at time of transfer, or later:
1. Safety certificate
2. Proof of insurance
3. Fee for new plate (since you don't have one already to reuse) - can't find the price and can't remember
4. $42 annual fee for plate validation sticker (southern Ontario)
5. If you plate it at a different time from when you transfer ownership, then you'll need to pay the $32 fee again for printing a new permit with the updated plate portiont