Well im not sure if you have to register it. But if you do want to register it then you have to bring proof of purchase to the US border. Then you have to wait 72 hours before going back. The US will give you paper back, then you bring bike to Canada customs pay a 200$ fee. They will get you to sign a form and within a few weeks you will get some paperwork in the mail. You take the paperwork and a recall notice letter - a dealer or manufacturer should be able to get it for you - to canadian tire. They make sure you did all the recalls required and also check to make sure the bike is safe for canadian roads and up to CDN standards such as km/h marking rather then miles/hr. Then they sign off on it and you go to the MTO and get your plates.
http://www.riv.ca/english/html/how_to_import.html
Ive had a few friends do this, it takes time but its easy.
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