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Some say that wd40 isn't the best penetrating oil. I've heard plus-gas being recommended, and also that vinegar is good.
re. heating to loosen the thread, its partly the different expansion rates of the alloy body compared to the brass (?) screw that loosens things off. The other factor is that the body receives heat first, so expands first. So, since you've got the carb off the bike, why not try the effect of cooling too. You could put it in the fridge, perhaps overnight, and see if that had any effect. Also, if it was all stone cold before you applied any heat, the screw would be at its smallest while the body expanded, so you'd get the best shot at it loosening, perhaps....?
Its worth trying the heat cycling thing a few times.
The other thing that often helps is a sharp (but not excessive) blow with a hammer and punch on the end of the screw, to jar the threads. This may also have the side effect of slightly restoring the screwdriver slot.
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