Regular maintenance on an HPA engine should be performed every 25-50k rounds depending on the conditions it is being used in. The dustier and dirtier the conditions, the more frequently it should be serviced. Maintaining the INFERNO requires disassembling the engine and lubricating/cleaning/replacing the O-Rings.
For detailed instructions, please see the Owner’s Manual for your engine.
For detailed instructions on the solenoid, please see the Solenoid Maintenance Guide.