#1- yes, your bike has the Mikuni BST-40 CV Carb, unless of course it's been changed from stock
#2- you will probably be running a 165-175 main jet, they run in units of 2.5 (ie. 160, 162.5, 165, 167.5, ... ) , and make sure you get the large round headed jets, not the small headed ones.
#3- you may want to also jump to the larger secondary jet of 47.5, the stock is 45. these are the only 2 options.
#4- here is a great site for explaining how to jet, it is for a Kawasucki but the principles are all the same http://justkdx.dirtrider.net/carbtuning.html
#5- since messing with the stock jetting, replacing the stock silencer (IDS2 with 12 disks), using racing airbox cover instead of stock, my bike always pops on decel. i've asked about this several times and read manya post about it and have come to the conclusion that it's due to the CV carb and not poor jetting.
good luck and have fun! your bike is going to feel like and sound like a monster when your done!!