I've never ridden a Gen1, but it would seem they have less breakable plastic than the newer ones. My recommendations would be an effective metal skid plate to prevent damage to the engine oil drain plug and some metal foot pegs instead of the stock rubber ones. Besides tires, after that it seems most lean toward adding things like crash bars and better hand guards to protect the levers and plastic, radiator and fan, etc. in the case of the inevitable tipover. I believe that even in its stock form, the limiting factor on trails for either model would be the skill of the rider, not the machine itself.
Last edited by planalp; 12-01-2012 at 12:33 AM.