1997 Johnson Evinrude "EU" 90 thru 115 90 CV Service Manual, P/N 507267, Page 70Get this manual
I11l Place vacuum passage O-ring into cavityApply OMC Triple-Guard grease to one end of the poppet spring, and install greased end onto the air motor diaphragm's poppet valve(The grease will help stabilize the spring while assembling
Install the air motor spring onto the air motor diaphragm