The idle screw is on top of the TORS box on top of a stock carb (unless a TORS delete kit and idle screw has been added ? )
remove your seat, lift the rubber flap and look under the fuel tank, it's the dime sized slotted screw head, I believe clockwise will raise the RPM's
clean the carb and jets.....
https://www.blasterforum.com/threads/how-to-clean-your-carbureutor.254/
Tune your airscrew (start at 1.5 turns out and) ...........
you are looking for the airscrew setting that achieves the highest idle.
from the 1.5 turns out, slowly start turning the screw in 1/2 turns at a time, allowing 15-20 seconds between turns for the engine to "catch up" to each new fuel/air setting.
repeat in the other direction from 1.5 turns out to 2.5-3+ turns out
find the turns in or out that the engine idles the highest, double check it, kill the engine and turn the screw in completely counting the turns as you do, write it down and return it to the newly found high idle setting.
if this # of turns is between 1/2 and 2-1/2 turns out, you are golden.
now you can do 1/8th turns each direction until it revs cleanly past 1/2 throttle, this can also be done while riding it to achieve good throttle response or daily to accommodate changing conditions
Airscrew ------>
Idle screw ---->
