Zach:
Thermostat control is only taking place at IDLE speed. There are some conditions (with only slightly elevated RPM's) where the poppet valve may be beginning to open (resulting in lower temps).
Would be curious as to what your water pressure is when the temps are reading lower....
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
Reply With Quote