You idle problem is from the slide either being loose and or too high. If you have the slide too high you are not using the pilot circut. Set theslide height at 2-3 mm use a drill bit or wire to set it. Then adjust the pilot and air screw.

To set the slide do you pull the slack out of the cable and use the cable to lift it or do you use the air screw for the idle.I had the idle screw all the way out and my piolt was set at 1/ half turn.Cable  was slacked.It would idle fine then if i reved it it would spike and didnt want to come down.Pwk was doing the same thing but on it when i would pull the choke it would raise the idle by alot untill it got rich. then fell off.It also would idle and the just shoot up for no reason.but only after i would run it hard it took its time to come back down..But not as bad.What year is your quad im running 91.I dont like the boot that goes from the airbox how it curves around the shock  to the carb a pain in the butt to get the bigger carb on. i was running 38pwk 195 main dgl needle and 65 piolt.Stock carb was 35 piolt not sure on the needle 230 main