Capacity has become meaningless as a measure of performance. Those air cooled pushrod carbed flat twin 800's put out about the same power (HP or KW) as a racing 125 or certain brands of 1400cc V-twin cruiser. An 800cc fuel injected DOHC watercooled parallel twin BMW not only puts out twice the power as a 700cc Ural but depending on who you talk to has modern materials (like bearings) that will take the extra load or is made of Chinese toffee. The features that make the F800 put out more power than the R80 from the same capacity change the support requirements.
IMHO you want to be shopping for a proven design who's mechanical features you are happy to support in the 15-70 HP area depending on how much stuff you carry.
I can't see the point of 1200cc/100HP for anything except sidecar duty, even Germans must get bored of trying to use a 170 kph bike where most roads have 50 limits and rarely average more than 80.
Andy
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