On the newer style 2 cycle 15 hp, 1993 - 2005 ? I see the t-stat has changed to a multi parts design, I have always tested the older one piece t-stats by placing them in hot water to see if they open at the correct temp. I was wondering how do these new type stats work,? & if it is possible to test them ??, I laid the whole contraption on the work bench and would like to understand the basics of how the system functions. thanks