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On fifth gear - the rpm are very close to mph x 100. So 50 mph = 5000, 80 mph = 8000 rpm, etc. As far as the rattle - it is most likely normal. Note that this is air cooled engine so there is more noise than in liquid cooled engine. Good indication of the state of the engine is - how easy it is to start and what is oil amount/condition after some riding. If you need to add oil and it gets dirty quick - it would indicate potential problems.
Also I would advise to check valve clearances (should be done every 3000 miles on this engine).
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