Service Procedure
Check all hoses and fittings for deterioration or plugging. Regulating valve should be cleaned, tested, and replaced if necessary every oil change. If system has a fixed orifice, insert a 5/64" drill through orifice and twist to clean. Air filter on "closed" system should be cleaned and replaced if necessary, every oil change. Oil filler cap on "open" system should be cleaned in solvent and air dried.