1987 Johnson/Evinrude CU Outboards 35A thru 55 Service Repair Manual P/N: 507616, Page 160Get this manual
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Pyrometer Procedure 1 Install correct test propeller and place engine in test tank
3 Reduce engine speed to 900 RPMAt 900 RPM, digitalpyrometer should indicate 1400 15 0F (600when held cylinder