As for temperatures, here is a good link of a chart of temps. Also the guy rode a KTM, areal off road bike, through SA. I wouldn't worry so much about planning exact rodes just go meet people and start asking. You might try reading/searching the many blogs under Travellers' Stories. I'm sure what every route you want to do has been done before.
A big bike like that is not really going to work well off road. Also, do you want to break something on a new production bike in the mountains of Guatemala or somewhere. This is not an invitation to be flamed.
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Brooklyn Dakar
http://motorcycleramblings.blogspot.com/
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