I don't think they are in any real numbers in New Zealand.
All you can do make sure the plug is new, air filter is clean and the jets are right.
You can probably check the jets are right easier if you do all the simple maintenance first then take it for a run wide open throttle then check the spark plug for colour.
when the engine is warm the air screw will make a slight difference at idle you will feel it smooth out a little but not much, as soon at you have gone past quarter throttle its on the needle height and main jet anyway. Set the idle at what ever you like around 800 rpm ish
Anything like a dirty filter/plug makes a disproportional difference with an engine that's used almost at its limit.
I have to move my needle up or down a notch depending on the season.
"Your talent determines what you can do. Your motivation determines how much you are willing to do. Your attitude determines how well you do it."
-Lou Holtz
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