Thor MX: 2017 Mammoth Motocross

The THOR MX amateurs came out swinging at the 50th Annual Mammoth Motocross. Hosted in the scenic eastern Sierra’s, Mammoth Motocross is one of the most iconic amateur races in the country. Rock River Yamaha’s Justin Cooper walked away as the undisputed king of Mammoth winning six out six motos.
Credit: Thor MX

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