I'm attempting to get my little (6' 210#) brother into riding. He's not a mechanical whiz so I'm looking for something fun on an MX track but somewhat low maintenance. My first thought was an XR400. I know it's not in the same class as a 426, but have any of you ridden one and how would you compare it to a 426? Also what mods are highly recommended before bringing it out to the track? I'm only asking for this comparison because the 426 is the only big 4 stroke I've ridden so it's my only reference. Thanks!