Pilot Report
The pilot reported that shortly after takeoff, while climbing through 200 feet, the engine rpm decreased to 1500 rpm. Adjusting the throttle settings produced no response. Unable to maintain altitude, the pilot maneuvered the airplane for a forced landing at a nearby sod farm. During the approach, the airplane stalled and landed hard just short of the intended touchdown location, then nosed over.
Examination Findings
An FAA Airworthiness Inspector examined the airplane and engine. The fuel selector valve was found to be improperly assembled; no detents could be felt. Cold differential compression readings for cylinder Nos. 1, 2, 3, and 4 were 20, 19, 54, and 5 psi, respectively. After adjusting the No. 2 cylinder valves, the cold compression reading for that cylinder increased to 50 plus psi. Fire damage was noted to the back side of the induction air filter assembly. The carburetor contained a two-piece venturi; an airworthiness directive required a one-piece venturi.
Maintenance Records
Maintenance records indicated that a one-piece venturi had been installed. The records also showed that the rocker arms were adjusted on April 21, 1997. The airplane had accumulated approximately 85 hours since that adjustment at the time of the accident.