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At batteries running (with muffs) 12.3 volts with tach not reading. Volts will jump up at higher rpms here's the crazy part the tach may read normal and
I believe I addressed the filters and screens you mention when I replaced THIS entire assembly (Honda P/N 16730-ZY3-A04). It appears
The separate spring above the thermostat is a pressure relief valve. Above a certain water pressure, the whole (closed) thermostat will lift against
I would advise pulling it again and getting that screen out. Replace if necessary. It should not be sticking in there.