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Viper Powersports is a motorcycle manufacturer founded in 2005 in suburban Minneapolis, Minnesota by John Silseth.
- Diamondback, 152 cu. in. V-twin cruiser
- Cooper, Lauren B. (August 10, 2010) "Viper Motorcycle moving HQ to Alabama." Birmingham News
- Hubbard, Russell (January 14, 20110) "Viper Powersports to build motorcycles in Auburn." Birmingham News
- Viper Powersports website