It is possible to tour on just about any bike, but two-up on a 650 single won;t be much fun, and your choice of routes might be reduced.
For two-up touring I would consider a road bike 750cc or larger, or trail bike 900cc or larger. Even then you'll have to very careful how much luggage to take. I work on the basis that if I can halve the weight of every single item, the overall weight will be halved. Even to the point of examining the contents of toilettries bag and so on.
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Dee Duble Yuh
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