MKTR401,
most thermostats have a bleed hole drilled in them to allow some circulation of the water until the valve opens .
I fitted a similar thermostat in my 400 and found that in the hot weather it must have restricted the flow of water and tended to run too hot .
Once removed the temperature was not a problem .
At GBP10 give one a trial over winter & summer .
If there is no bleed hole , drill one about 1/8 inch in diameter
Geoff
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