Polaris rear end squeaks

power to efi module? no, find where it stopped and reconnect.
yes, power out of efi module? no, replace efi module.
yes, open between efi and pump.

If the water was drained then filled with gas again and only ran about 20 yards, it is quite possible the residual water caused the piston to gall on the rod, meaning possible replacement or rebuild. This would be a worse case scenerio

fuel ? clogged ? spark plug fouling ? bad fuel in tank ? remove gas cap and lightly smell the fumes from gas tank it will smell sour or stale if bad. has foul odor. drain old gas add new clean fuel.fuel additive good investment if not run everyday.good luck

if you are finding gas in the crank case, the most possible reason there is a crack in the motor case or cylinder wall, or bad ring or cylinder.

if it has independent suspension then the clicking noise may be a failing cv joint (" U" )in the drive axle
suspension don't click--rattle ,knock squeak yes but not click

Sounds like a carb issue...make sure you have fresh ,clean gas.You havent got water in your carb/tank have you? I would start by taking the carb apart and give it a really good clean.Check all jets and orifices.Another words,take apart anything in the carb that you can,clean and replace.

sounds like the Rev limiter is being engaged for some reason, had that happen on my Polaris express, the problem was moisture.

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.

you ever change the hub fluid?

The belt and pulleys are probably not the cause with the sound you are describing. To me it sounds more mechanical when you say grinding. Have you checked the rear dif?