Yamaha’s web site features details on Yamaha Factory Racing’s Grant Langston and the 2008 YZ405F he rode to #1 for the 2007 AMA Championship.
According to Yamaha’s Site…
Yamaha Factory Racing’s Grant Langston has put Yamaha back on top of AMA Motocross for the first time since 1998 by winning the 2007 championship with a stunning pair of rides in San Bernadino, California, on Sunday, September 9. He flew his 2008 YZ450F to a win in the first moto and played it smart in the second to take a third-place finish, the overall win, and the historic title. Langston now has the personal distinction of holding AMA Motocross and Motocross Lites titles as well as a world MX2 title.
This is great news for Yamaha as they promote the 2008 YZ405F. For 2008, the the ﬁve-titanium-valved YZ405F features chassis and engine reﬁnements, subtle modiﬁcations to the aluminum frame and suspension and new head and exhaust design for low- to midrange power without losing top end power.