2016 Polaris Sportsman 570 starts but won't stay running

[WyattLemke25]

Working on a 2016 Sportsman 570 and it has a new battery and spark plug. No codes, fuses all look good. It cranks for a while and when it starts it will only run for a few seconds before stalling. At one point it was running at 3000 rpm with no throttle input, then it dies. Not sure where to look besides messing with the throttle cable, so suggestions are appreciated, Thanks. 

[Mech]

The idle speed valve or motors can get sticky, especially the valve sorts.. I'd probably check that first up.

[Gwbarm]

Try some fuel injector or throttle body cleaner .

[flyinbrian365]

Check the valve clearance, I've had very similar issues with customers machines.

Also check the fuel pressure is at spec and make sure the injector is clean I've had them varnish up like carbs and not spray correctly.

[Gwbarm]

My thoughts exactly Fly, thanks for the details.

[WyattLemke25]

Thanks for the suggestions. I ended up loaning a fuel pressure test kit and I'm only getting around 20psi on prime and cranking. So I've got the fuel pump out and am going to look into a replacement. The pump does sound a little strange compared to our 3 2016 570's which all make the same pitched whine. This one just doesn't sound as healthy so I feel like there's more than enough symptoms to warrant a replacement. I'm working on this for someone so I'm not exactly sure how it was acting before it stopped running, but it's got 4300 miles and 380 hours. 

Also, when I was first looking into the throttle cable I found part of a ziptie placed in between the two contacts inside of the throttle..The current owner did not put it there. Any insight on that?

Edited December 19, 2023 by WyattLemke25
add more info

[Gwbarm]

Yeah fuel pressure should be around 40 PSI. As far as the zip tie, the only thing i can think of is someone didnt want the contacts to touch, or it was a left over shipping item that dealer forgot to remove.

[flyinbrian365]

If the throttle cable isn't adjusted correctly the ignition will be shut off when the throttle is released and the machine won't idle.

People install the zip tie so the contacts won't shut the ignition off.

Adjust the throttle free play to factory specs and remove the zip tie. 

[Gwbarm]

Ahh! Annoying safety feature.

[WyattLemke25]

Thanks for all of the suggestions. The problem was the fuel pump. Put in an All Balls Module, got everything put back together and adjusted the throttle cable to where it should be and it's running and driving great! Was a nice project to learn a little more about these machines. 

[Gwbarm]

Good Job getting it going, i have also been using All Balls carb kits and fuels parts have been very impressed with them so far.