1998 Johnson Evinrude "EC" 90, 100C, 105C, 115, 150, 150C, 175 60 deg. LV Service Manual, P/N 520210, Page 153Get this manual
Thermomelt Stik Procedure
Twist and remove spark plug leads before changing propellers to avoid accidental starting of engine
1Install correct test propeller and place engine in test tank2Start engine and run at 3000 RPM for at least five minutes
rn 3Reduceboth cylinder headsrun engineFat 900 RPM afor fiveF engine speed and minutesMark with 125 (52 C) and 163
(73 C) Thermomelt Stik4At 900 RPM, the 1250 (52 C) marks should be liquid and glossyThe 1630 (73 C) marks should remain dull and chalky If the 1250 (52 C) marks are not liquid and glossy, troubleshoot the cooling system for causes of over cooling If the 163 (73 C) marks become liquid and glossy, troubleshoot the cooling system for causes of overheating 0