the best thing for keeping the motor hot while at idle, is to use a 1/10 scale foam tire insert and put it around the head. Fits snug and is a hell of a lot easier than wrapping in tin foil.

I did what Brandon Powell did, but only idled 4 tanks, then drove it rich but WITH the foam on the head and it stayed around 240. After 4 tanks of that, start rae tune.

I have 5 gallons on mine and it feels like it did after 2 gallons.