Mullins went from the Am-Pro Yamaha team (2005-2008) to a FMF / Suzuki ride (2009), then to the Obermeyer Yamaha team in 2010, winning the National Enduro championship... plus 2nd O.A. in the GNCC's.
BTW... Randy Hawkins won the last National Enduro title for Yamaha back in 2004.