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Hi and thank you for the question.
Is the engine getting hot? Typically on a flush kit the engine, especially the cylinder head, is quite cool. You should be able to touch the head and leave your hand there with no fear of burning.
The water lock box gets HOT. It is more important that the engine, IE cylinder head, doesn't get hot.If you check while riding, the head will be very warm, but not burn you when you touch it. The safest way to test is to sprinkle water on it, to make sure it doesn't sizzle off, before you touch it with your fingers. If you were riding it and the water out the tell tale hole was hot, it is not a concern, that would be typical.
Were you able to gather any more data on this? Is the cylinder head getting too hot? If you drip water on it, does it sizzle and boil off? If it does, it is definitely getting too hot.
Let me know where you are at on this.