2004 Big Dog Motorcycles Mastiff , This 2004 Big Dog Mastiff has very low miles and garaged with single owner. Never dropped or crashed. Engine is S&S 107 CI, 6 Speed transmission, electronic ignition with 240/40x18 rear tire. Extremely clean and well cared for. Intake and exhaust upgraded and belt drive changed to chain. Rear suction seat, battery tender and rotor lock included. $10,000.00 5136154335