2000 Johnson/Evinrude SS 25, 35 3-Cylinder outboards Service Manual, Page 123Get this manual
Retaining Ring Pliers
Thermomelt Stik Procedure
InTwist and remove spark plug leads before changing propellers to avoid accidental starting of engine1Install correct test propeller and place engine in test tank2Start engine and run at 3000 RPM for at least five minutes
3Reduce engine speed and run engine at 900 RPM for five minutesMark the cylinder head with 1250 (52 C) and 1630 (73 C) Thermomelt Stik
4At 900 RPM, the 1250 (52 C) mark should be liquid and glossyThe 163 (73 C) mark should remain dull and chalky If the 1250 (52 C) mark does not remain liquid and glossy, troubleshoot the cooling system for causes of over cooling If the 1630 (73 C) mark becomes liquid and glossy, troubleshoot the cooling system for causes of overheating