RedactedNarrative: Operator and passenger went fishing early am. Wind picked up as forecast and they decided to come in. They approached old keystone ramp no wake zone approx. 0930. For unknown reason motor quit. While trying to start motor, boat swamped. Both occupants put on pfds and were ejected when boat capsized. Both stayed with boat and drifted n/ne to indian point approx. 0.69 mi. And were able to get out of water. At approx. 1250hrs a passing fisherman saw them, tended to them and called for rescue. Both subjects were rescued at approx. 1400hrs. By oklahoma highway patrol marine enforcement trooper and transported to emsa at old keystone ramp. Aoi of swamping was approx. 0.11mi n of old keystone ramp and 0.09 mi west of east shoreline of coyote trail point and 0.69mi s/sw of indian point.