1991 Johnson/Evinrude EI 60 thru 70 outboards Service Manual, Page 69Get this manual
Testing Purpose
The following procedure is designed to help you isolate defective component in the boat or engine fuel systemThe problem might cause loss of engine performance or, if left unrepaired, might cause serious powerhead damageAfter you have isolated the component, refer to Servicing, this Section, for specific repair proceduresTesting Procedure
i propellers, twist and remove all spark plug leads
"" To avoid accidental starting of engine while changing
INote Some checks require that the engine be run at full throttle
under loadInstall the correct test propeller and run the engine in suitable test tank1Start engine and allow it to reach normal operating temperature