1997 Johnson Evinrude "EU" 40 thru 55 2-Cylinder Service Manual, P/N 507265, Page 93Get this manual
Float Valve Assembly
1Inspect the inlet needle and float valve seat: [[] Check inlet needle tip for grooves, nicks, scratches, or distortion Check float valve seat for nicks, scratches, or distortion Check float for signs of oil or gasoline saturation
INote Inlet needle and float valve seat must be replaced as setCarburetor Body
1Check all drillings and passages with syringe filled with isopropyl alcohol2Visually inspect all gasket surfaces for nicks or irregularities3Check for excessive throttle shaft playCheck for throttle valve misalignment