Polaris idle My idle jumps around from 1200 to 1700 how do I solve

Throttle stop screw.
On the left side of the vehicle, looking in at the carburetor, notice a screw pointing straight down near the bottom of the carb, slightly forward.
Turn the throttle stop screw clockwise to increase idle, counterclockwise to decrease idle. It is best to adjust the idle while at operating temperature, but be careful, it's hot in there! just bring it up until it smooths out.
Do not overcompensate to mask something more serious like a cracked or weathered intake manifold.
It is not an issue of 'If' the intake will fail, It is 'When' it will fail. Just fix it before it fails you at a less convenient time. Not good on a trip I can tell you that.

Check got a air leak between carb. And eng. that will make it run lean and high idle

Adjust your engine idle its idling to high.

i dont no your model,but it is usually a screw on the carburettor.turn one way to idle up the other way to idle down

If a tune up doesn't help, rebuild the carb. the ethanol in gas ruins the gaskets.

follow ur throttle cable down to cars there should be a plastic screw close to cable to adjust idea but with polaris that screw can be hard to find with all the plasticc they put in way but if u can see carbs easy enough u will see the idle screw

I have seen this on a few machines. Start tracing wires. Ground wire from the key is the first on Id check. Grounds on these machines go bad from vibration and rough terrain. Not to mention silt in the water.

Check Float Height and reset the airscrew to around 1 -1 1/2 and make sure all jets are clean

First question since i am assuming it was just sitting around for some time if i am correct you need to pull the carb remove the float bowl and components if everything was done correctly with your rebuild the likely problem is your carb is gummed up remove everything in the carb low speed jet etc. soak everything in sea foam fuel cleaner overnight and hopefully you have some compressed air and blow out that low speed jet and passage way pay close attention that you have see fluid coming from the other end and check the jet make sure it is unclogged hold it up to the light.

All most positive it is in your carb take the bowl off it as you take it off there is a small tube that hangs down that all most reaches the bottom of the bowl need to take a small wire and push through it it is blocked .symptoms backfiring no idle coughing and sputtering if it does start