I also think norway is a fantastic country with a fantastic landscape - specially with motorbike/sidecar in winter! In te last 30 years I had fantastic moments in Norway with my sidecar Motorbike in Winter, Camper in summer and last year with the mog.
Please imagine, that some roads are closed from november until june. Sometimes roads are closed over night and sometimes there is fresh snow in june.
Last june we traveled with our mog between Trondheim, Lillehammer and Bergen. One day we stopped in the mountains and had to turn back because it starts to snow.
As others wrote: One week is a very short time, specially if you drive over the mountains or in the fjord district. In Norway you need more time than in other countries to reach the point you want to.
Here you get important informations about the roads you want to travell
http://www.vegvesen.no/trafikkinformasjon/Reiseinformasjon/TrafikkmeldingerAnd I think it is a good idea to plan in the morning where to stay over night if you make a trip trough the landscape an not to the towns in the south or at the coast. there are some districts where you have to drive some hours to find a hotel!