1997 Johnson Evinrude "EU" 125C, 130, 200, 225, 250 90 LV Service Manual, P/N 507269, Page 96Get this manual
Place vacuum passage O-ring into cavity
Apply 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