My friends have a race team comprised of all Predators. One friend has a YFZ450, another with a 450r and i have the LTZ400. We all raced ATVA nationals, and hit almost every race.
Here is my take:
MY Predator friends HAVE TO and CAN ONLY race in the Open class b/c of the CC limitations. If you want to race in all other classes you will not be able to because you have too many cc's. All of their motors (predator guys) are 560s with one being a 580. One has the (580cc motor) HPD +3intake & +2 exhaust head, one with +1, +1. All of them are fully laid out with all the mods, high comp pistons, carb, port and polish, full exhaust, cams, LT suspension, etc etc.
The YFZ and honda are both laid out suspension wise with only High comp pistons P&P, and cams. we have switch bikes & ridden them on our tracks and consistently the YFZ and Honda run quicker times. On the tracks, watchin them at the nationals, the Predator doesn't seem to have all the power the YFZ does. I have seen a fully bored out YFZ with everything in the motor and it spanked the 580 with the largest HPD head, where both riders are A class and equals to each other.
Out of the box, i think the predator is better, plug in for kill switch, mega strong axle, race tires, amazing shocks, just ready for racing. If i had to pick from my experience i would go with a yahama. sorry! I think the Polaris is one h3LL of a machine but compared to the competition (non pro-riders), i think the Polaris cannot stay with the competition.
2009 YFZ450R
Baldwin, DID, DP, Houser, JB, Maxxis, PD, PCV, PEP, LSR, Rath, RPM, Sparks, SSI, SunStar, Works Connection
Special thanks to Baldwin Motorsports, PEP, SSI Decals, & my checkbook!!