I would guess the craptor.
Im guessing the honda will have similar performance as the YZF and I read in a magizine artical when they asked some of the Yami test riders which was faster the YZF or Craptor if I remember correctly they said that the YZF was faster off the line but the Craptor was a little faster on the top end by about 2-3mph.
But like everyone else said... who cares about a drag race, the 450R is built for MX. Im sure both the 450R and YZF would put a mighty whoopin on a craptor at the track.
The craptor is just a light trail/dune quad. IMO
2000 400EX
416, Wiesco 11:1, FDO Studs, XR head gasket, Port and Polished head, 3 angle valve job, Hotcams Stage II, CRF 450 Timing Chain, Jegs Oil Cooler, K&N, EHS Air Box Lid, Choke removed, Sparks X6, 42pilot, 168main, Gusseted Frame, Ohlins, OMF Scoops, Shaved fenders, DG Pro-Pegs, AC front bumper, Armadillo .250 skid, 909 bars, Twist throttle, Maier Handguards, ITP beadlocks, Kenda Klaw XC's, LSR anti-fade hub, Mezaros Billit Bearing Carrier.