Specifically to that tuning point--My other quad is a 2001 raptor.  My winter project was to install a bigger piston --686cc vs 660 at 12:1 compression. New pipe, open airbox and stage 2 cam.  I had contacted CT racing for their Jet kit that was supose to be the correct jets for my set up at 5000 feet 60 degree day...  After running it very rich for brake in I put in the "jet kit with new needles and 160/165 main jets.   It ran better than stock' but was not spot on.   I put it on dyno to get a reading--it was very rich---I put needle clip on leanest setting with jet kit and dropped mains---back on dyno.  Now it was better but still too rich mid and top.  I put the stock needle back in on richest position and dropped mains yet again to 145/150.  Now were talking....   So my point is even good reputable builders (CT has never done me wrong) can only give their best guess as to what jets your specific bike needs--especially when elevation changes come to play.  The dyno time ran 75 dollars--for them  to do multiple test runs and I made the appropriate jetting changes based on the dyno AF readings.  Now I know its right for where I ride and weather/altitude changes will be easy as I have a good baseline.  75 dollars very well spent.  Results

The dyno numbers went from 42 hp 36 torque to just over 50. hp and 41 ft.lbs torque.  They say their dyno is a little stingy and If I would have run dyno tires VS my knobbies  it would have shown a few more hp. (is that true--does a dyno tire show more power---if so why? )
I was pleased as the raptor  EFI 700 that they just installed dual barkers exhaust i, intake, and power comander--after its dyno tuning only made 48 hp  38 ish torque---the  efi 700 made a few more hp down below 5000 rpm but my 660 with cam pulled max power about 2000 rpm longer....I would have thought both our machines would have made more power but it is what it is and they did say their dyno was stingy...what ever thats worth...Fun evening anyway,  as its the first time I have ever had a quad on a dyno and the  8 hp gain from being properly tuned vs taking a "jet kit" and slapping it in was worthwhile.