1995 Johnson/Evinrude Outboards 50 thru 70 3-cylinder Service Manual, Page 278Get this manual
Motor Test, No Load
Notel ?ecur.ely fa.sten motor in suitable fixture before proceedIng with thiS test1Use battery rated at 360 CCA (50 amp hrs) or higherThe battery must be fully chargedRefer to Battery Specifications, Electrical Section2Connect 0-50 amp ammeter in series with the battery's terminal, ammeter RED lead toward battery
f1l 3Attach or hold vibration or mechanical tachometer to the motor while performing this testf1l 4Monitor motor RPM and current drawRefer to the chart below for the correct specifications for your motor