Dude, a WR on the track will be worked just as hard as a YZF. Rebuild intervals would be virtually the same. Trail riding a WR would be considerably easier on the bike vs the track but the same thing can be said with a YZF. Reliability wise is a moot point... mateninece is different. Although I don't go to mx tracks I will go to a 500 arce peice of land does actually include some jumps, bulldozer wild trails, single tracks, long straight a ways, and rough long stretchs of rocks. Plenty of points were you could about ride it like a mx track. But I font got the money to rebuild each and every year. With the WR's they can go forever without a rebuild. That's why I got one.