1994 Johnson/Evinrude Outboards 40 thru 55 Service Manual, Page 94Get this manual
Assembly
When assembling the fuel piston, always install new washer and stem in addition to other new parts requiredBe sure to lightly tighten stem with fingers; never with pliers
f61 Lubricate stem with Evinrude or Johnson Outboard Lubricant
and slide it into hole in center of intermediate housingf71lnstall new washer on air motor piston screwThen, thread L!.J air motor piston onto stem with clockwise rotationPush poppet valve in (toward the stem) to hold the screw in place while turningTighten 1f4 turn past point of contact