Compressor help

Yeah I Ment burst disk sorry auto correct. I have a spark compressor witch is having problems building pressure above 3k motor stalls on the 110 converter. 12v runs better still struggles. I don’t know if this thing is a vent or blew out burst disk but when I took it out n covered it with my finger it ran like new. But could only cover is for seconds because of the heat. Here is a photo

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Then I am lost at this point. Unless I can’t the chance n pull the piston apart even though I don’t know what am looking for. So either the inverter is dropping out pressure or it’s like a hydro lock or something because once it stalls even flipped the switch over n over will do nothing. Till all the pressure is released then the motor will come back on again