1991 Johnson/Evinrude EI 60 thru 70 outboards Service Manual, Page 140Get this manual
Engine Temperature Check The Market Thermomelt Stik is heat-sensitive marker that melts on contact with surface of specific temperatureOne source for Thermomelt Stiks is Stevens Instrument Company
rv At least twoaccurately determineorthedigital pyrometer should Thermomelt Stiks L.J be used to engine's operating temperaturesThe Thermomelt Stik mark will appear dull and chalky when the surface marked is below the Stik's rated temperatureWhen the surface exceeds the Stik's rated temperature, the mark will appear liquid and glossyTo achieve accurate and consistent readings, engine temperature must be gauged at the top of cylinder headFor the following engine operating temperatures and RPM figures to be correct, the inlet water temperature must be 700 100 (21 30 C)
Thermomelt Stik Procedure
1Install correct test propeller and place engine in test tank
i propellers to avoid accidental starting of engine