As many of you have known, I have had some recent issues with my 6.5 Honda powered Kohler genset. I believe it to be a 6.5CZ (per the build sheet) The ID plate is missing, so it is like looking for a needle in a haystack. I have pretty much seem to have it running and not shutting off. However, need one help on the following:

The coolant will expand into the recovery tank, but not siphon back in. Tube is connected to the bottom of recovery tank and no leaks. ((Pressure cap was new with heat exchanger 2 years ago, Pressure Cap?))

I have attached photos of what I believe to be the high temp cut off switch and the choke switch. Both are located below the thermostat housing.

I believe this sensor to be defective, s it spins in the crimped brass boss. I cant find a description anywhere in any manual. ANy ideas of what it is and a part number?

Very helpful group here and I am thankful for all of your input!