I read a while back that the WR426 would top out at 90mph with stock gearing. Naturally, I figured the WR450 would be around the same. Well, I ran my WR450 WFO for nearly two miles down a stretch of dirt road this afternoon and could only muster 82.7mph, according to the gps. It sounded like it was still winding up but I didn't want to blow it up so I backed off. It's geared with the stock 14/50 sprockets. Anyone tried WFO with your WR450's yet?? Just curious.