The WR engine, uncorked, is simply incredible. The rider has a choice of power output from about 20 HP fully corked to 50+ HP with a muffler, the GYTR tuner and an inexpensive cam swap or degreeing. That versatility makes it easy to tune for just about any riding situation.
I think the WR450F is overweight in stock form. Fortunately its pretty easy to remove 20+ pounds from the bike, mostly placed high on the bike, and it feels like a totally different bike when you do.
FYI, a stock 2014 YZ450F weighs 245 lbs with fuel and no off road equipment. Thats 235 pounds dry. I've got my 2012 WR450F down to 240 pounds dry with some off road equipment.
240 pounds is awesome! What all did you do to get it that low?