I would suggest that the long tail of rubber has been drawn in to the carburretor venturi and has been flapping around in the airflow.
That would give you a disrupted airflow and a loss of power.
Saw something similar on a Cessna 152 that ingested a piece of baffle rubber.
Cause I would suggest is that on installation the filter has been forced over a lip at an angle guillotining the rubber edge.
No fault of the filter.
Last edited by ericferret; 21st Jul 2012 at 18:06.