Aviation accident LAX00FA208

A partial loss of power due to water contamination in the fuel system and the pilot's inadequate preflight inspection, which failed to detect the water. The pilot's failure to perform an engine run-up before takeoff is also causal. Additional causes are the pilot's failure to maintain an adequate airspeed margin for the bank angle he initiated during the attempted return to runway maneuver and the resultant encounter with a stall/spin. Factors in the accident include the pilot's failure to detect the power deficiency early in the takeoff roll due to his diverted attention by a nonpertinent personal conversation with the local controller, and, the lack of suitable forced landing sites in the takeoff flight path.