What happened
During the takeoff and initial climb phase, the pilot reported that the engine was performing well during the run-up. However, the aircraft experienced a slow rate of climb. Shortly thereafter, the engine began sputtering without warning. The pilot attempted to maintain engine operation by using the primer for a short period, but ultimately initiated a forced landing into a field.
During the landing roll, the aircraft sustained substantial damage.
The investigation
A post-accident inspection of the engine was conducted to determine the source of the engine sputtering. Investigators discovered that a non-approved cork-type material gasket had been used around the gascolator. This material had disintegrated, which subsequently plugged the fuel line. Following the removal of the debris, the engine was tested under normal operating conditions and functioned correctly.