1998 Johnson Evinrude "EC" 90, 115 SPL Service Manual, P/N 520209, Page 74Get this manual
Primer System ServicingElectric Start Models Function Test
1Start engine and allow it to reach normal operating temperatureSet engine speed at 2000 RPM
2While engine is running, push key in Engine should run rich and drop 1000 RPM
3Stop engineRemove air silencer assembly
DRC6140
4Remove primer hose from any intake manifold or carburetor primer fitting that you suspect is cloggedConnect 's inI.Dclear vinyl hose between the fitting and syringe filled with isopropyl alcohol5Press lightly on the syringe If fluid moves through the fitting, it is okay