Yamaha F100B F100C Outboards Factory Service Manual, Page 61Get this manual
Power unit 6Install the spark plug, tighten it finger tight b, then to the specified torque with spark plug wrench c
S60C3330
5Check the thermostat valve opening at the specified water temperaturesReplace if out of specificationSpark plug: 25 Nm (2.5 kgfm, 18 ftlb)Checking the thermostat
1Remove the flywheel magnet cover2Disconnect the cooling water hose 1, and then remove the thermostat cover and thermostat 3Water temperature 50 (122 F) above 60 (140 F)
Valve lift mm (0 in) (When the valve begins to open more than 4.3 mm (0.17 in)