January 2008
Dirt Bike;Jan2008, Vol. 38 Issue 1, p26
The article discusses off-road motorcycles like Yamaha's WR450F bikes that have to meet U.S. Environmental Protection Agency (EPA) standards for noise and air pollution. The article states that WR450Fs can be modified, but modifications will likely mean that bikes will no longer pass EPA standards. The author and his team modified the WR with parts from an YZ450F and other bikes to see what could be done to the performance of the bike while preserving the emissions rating.


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