1990 Johnson Evinrude "ES" 60 thru 70 Service Manual, P/N 507873, Page 79Get this manual
Primer System ServicingVRol Models Functional Test 1Start engine and allow it to reach normal operating temperatureSet engine speed at 2000 RPM[1 While engine is running, push in key Engine should run richly and drop 1000 RPM
3Remove air silencer assembly
4Remove primer hose from any intake manifold or carburetor primer fitting that you suspect is cloggedConnect 1a inch IDclear vinyl hose between the fitting and syringe filled with isopropyl alcohol5Press lightly on the syringe If fluid moves through the fitting, it is okay If fluid does not move through the fitting, clean with OMC Cleaning Tool PI 326623