1997 Johnson Evinrude "EU" Accessories Service Manual, P/N 507270, Page 92Get this manual
Motor Test, No Load
INote Securely fasten motor in suitable fixture before proceeding with this test1Use battery rated at 360 CCA (50 amp-hr) or higher that is in good condition and fully charged to perform this test2Connect 0-50 amp ammeter in series with the battery's terminal, ammeter RED lead toward battery
3Attach or hold vibration or mechanical tachometer to the motor while performing this test4Monitor motor RPM and current drawRefer to the chart below for the correct specifications for your motor