I have to agree w/ Hawaii-Rider. I am 42 and 195lbs. I have the WR250F and find that it is probably the best bike out there for my riding style (woods, trails). It has all the power I need and it is light enough to through it around anywhere all day. Try that with one of the 4xx+ and you are going to be one tired-hurting pup by the end of the day. It is also one of the tallest bikes out there for you vertically unchallenged riders.
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'01 WR250F
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'01 WR250F