1990 Johnson Evinrude "ES" Cross V 88 thru 115, 150 thru 175, P/N 507874, Page 73Get this manual
Primer System ServicingAll Models Functional Test 1Start engine and allow it to reach normal operating temperatureSet engine speed at 2000 "PM
[!] 2While engine is running, push in key Engine should run richly and drop 1000 RPM 3Remove air silencer assembly
r:;, 4Remove primer hose from any intake manifold or carburetprimer fitting that you suspect is cloggedConnect Va inch J.Dclear vinyl hose between the fitting and syringe filled with isopropyl alcohol