Elaine:
You can easily cross Canada (Halifax to Vancouver Island) without ever leaving pavement. I've done the ride myself several time with my ST1100.
To put your question in context, it would be like a Canadian asking if it was possible to travel from Penzance to Carlisle on a CBF 1000 without concerns about unpaved roads.
Of greater concern to you will be the climatic variations you will encounter on that route. The route north of the great lakes is wonderful, but the weather up there can be a little cool prior to about June 10th. In my opinion, the ideal time to begin your trip (ex Halifax) would be about June 1. Any earlier than that and you will need clothing that is heavier than 'summer weight'. Vancouver Island (where I live) is mild all year round, but I suggest you plan your trip such that you cross the Rocky Mountains (heading west) prior to September 1.
No need to be concerned about a lack of pavement in America (the USA) either. However, if you are considering Central and South America, well, that's another subject altogether.
Michael
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