The stress across a surface element (yellow disk) is the force that the material on one side (top ball) exerts on the material on the other side (bottom ball), divided by the area of the surface.
Overview. The WR450F retails for $8,290, making it the sixth-most expensive 450cc 4-stroke enduro bike of 2013. It comes equipped with a 449cc engine, which is slightly larger than average for a 4-stroke motor.he WR450F retails for $8,290, making it the sixth-most expensive 450cc 4-stroke enduro bike of 2013.
Added to the MSRP of $8,090 thatâs over $500 CHEAPER than a stock KTM 450 XC-W (based on a $9,200 MSRP). Florida Torture The opening round of the GNCC series in Florida is notoriously brutal. Yamaha is confident enough in their new WR450F to take it right to the fight there.he 2012 Yamaha WR450F is here. But before we get into everything new, updated, borrowed and unique, you might want to ask yourself what your perfect 450cc-class off-road bike would be. Donât compromise. Set your expectations high. After all, this is 2012.