If you can do your KTM carb, you can do one of these. Probably have to take the front plastic and fuel tank off to get to it. After that it's not that difficult. Take your time and pay attention. It will probably take more time to get it off and the machine buttoned back up than it will to do the rebuild. Polaris does not use gaskets but an o-ring seal instead so you don't need to replace that part. Get a kit on line from an aftermarket company. Polaris does not sell a kit, but each individual part. While you are at it, pick up 4 stainless 4mmX16mm socket head screws and replace the float bowl screws. The phillips head on the OEM pieces hog out easily.
Most likely suspect inside there is the needle and seat. Some have an O-ring on the seat which is held to the carb body with a small clamp. The ethanol in our fuels tends to harden them and they fail. Another possibility is some kind of debris got past the filter and is holding the needle open.
2001 Magnum 325 with a blown engine; rebuilt 2004. Broke timeing chain 2016 rebuilt again and still running. Warn winch and Moose 60" plow
2007 Sportsman 500 EFI, Polaris Winch, 26" Bear Claw HTRs on Moose 427x Wheels. 12x7 front, 12x8 rear, QSC Clutch Kit
My Trail Machine:
2004 Sportsman 600 Twin, 25" RipSaw Tires on stock steel wheels, Moose rear box
Completed Project machine:
2001 Magnum 325 MOSE with a blown engine. Transplanted a 2005 Magnum 330 engine. Committed suicide on the trail Oct 2016. Spun Rod Bearing after oild cooler line failure. Rebuilding Engine.