So I just bought some Gripsters to attend some track days at NHIS on my '01 WR-426, and I'm getting some "concerns" from a track day organizer. He told me this: "Keep in mind our last yamaha dirt bike threw a rod and blew up his motor... dumping oil on the track. My belief is those motors are not meant for running wide open... very few trails you can just leave it pinned." From what I've read here, a buch of guys have run the WR's at the track, and I run mine on the street all the time. They seem to be ideal for switching between the two (track and street). I got in to the WR because it seems to be the "everything" bike. Is he upset that a former track day attendee fouled up a track day or should I be legitimately concerned? I'm looking for some input before I put any more money into the bike for the SM switchover.