I run a Jabiru 220A Gen 3 Hydraulic Lifter engine in a X Air Hawk. What is the acceptable temp in Deg C for full operation after warm up?
I assume you are talking about cylinder head temperatures. In this case it is 180C max continious and 200C max 5 minutes.
However in the interests of operations in hot weather, normally it is good to have some margin before reaching these temperatures. X air's do run hot and it doesn't help their engine life. If you haven't already it is a good idea to have a cht on each cylinder. As the engine isn't cowled there may be some things you can do to improve cooling.