I had a DR200 a few years ago and sold it to buy a WR250R. I doubt that a taller gear will help the DR200 in the stock aero configuration. My expereanc was that as long as you don't have to go over 60 mph the bike is happy. The bike just does not have enough power to drive itself through the air at over 60 - 70 mph without a substantial reduction in drag! The bike has great potential for high mpg numbers but major improvements to aerodynamics is the key. Take a look at creagvetter.com for some Ideas. The area I would suggest is behind the rider cargo space with aerodynamic tapered shape.
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