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Why does my 1999 Polarish Sportsman 500 idle ok but backfires and loses power with RPM's?

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Scott Tx

ATVs Expert 604 Answers
Posted on Nov 24, 2014

Scott Tx

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Joined: Oct 11, 2008

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Sounds like you need to clean your carb

1 Related Answer

brandon lilly

18 Answers
Posted on Feb 11, 2014

SOURCE: How to turn up idle on 2013 polaris sportsman 500 ho

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

Testimonial: "Thx"

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1999 Polaris Sportsman 500. I have fuel leaking from the tank fitting that the hose to the fuel shutoff goes. When I try to tighten it, it leaks more. Any suggestions?

Question edited for clarity.
Question moved to a Polaris Category.

Normally, you would just drain the tank, remove the fitting and replace the gasket. I don't see a gasket though, unless it is just a standard O-ring. That is the way to do it though.

https://www.google.com/search?q=1999+polaris+sportsman+500+fuel+tank+gasket

https://www.google.com/search?q=1999+polaris+sportsman+500+fuel+tank+leaking+from+bottom

..

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Jul 29, 2023 • Polaris 2004 Sportsman 500 H.O

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1answer

1999 Polaris Sportsman 500. Why will it not turn off please?

Question edited for clarity and typos, and guessing it is a 'Polaris' and not a 'polar'.
Question moved to model category.

It is a known issue. You likely need a new switch, they burn the contacts with prolonged use.

https://www.google.com/search?q=1999+Polaris+Sportsman+500.+Why+will+it+not+turn+off

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Dec 31, 2022 • Polaris 2004 Sportsman 500 H.O

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1answer

I HAVE A 97 POLARIS 500 SPORTSMAN. INSTALLED NEW CARBURETOR ,IDLES ROUGH AND WONT REV, BUT BACKFIRES WHEN I TRY.

Hi there,

Have you check the valves and the valve gaps?? Sometimes but not always having the wrong valve gaps can cause backfires. Have you also tried tweaking the carburetor to try and improve the idle??

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Jan 04, 2020 • ATVs

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1answer

I have a 99 Polaris sportsman 500 ebs and it will start and only idle. I give it gas and it bogs and backfires through carb. I replaced cam and rocker arms and put a new carb on. What could it be?

clogged exhaust?? maybe the cdi screwing up?

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Mar 12, 2018 • ATVs

0answers

sounds like you have an air leak on the intake somewhere

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Jul 12, 2017 • Polaris ATV

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1999 Polaris Sportsman 500. I have fuel leaking from the tank fitting that the hose to the fuel shutoff goes. When I try to tighten it, it leaks more. Any suggestions?

Polaris 2004 Sportsman 500 H.O

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Why does my 1999 Polarish Sportsman 500 idle ok but backfires and loses power with RPM's?

1 Answer

Scott Tx

1 Related Answer

brandon lilly

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1999 Polaris Sportsman 500. I have fuel leaking from the tank fitting that the hose to the fuel shutoff goes. When I try to tighten it, it leaks more. Any suggestions?

1999 Polaris Sportsman 500. Why will it not turn off please?

I HAVE A 97 POLARIS 500 SPORTSMAN. INSTALLED NEW CARBURETOR ,IDLES ROUGH AND WONT REV, BUT BACKFIRES WHEN I TRY.

I have a 99 Polaris sportsman 500 ebs and it will start and only idle. I give it gas and it bogs and backfires through carb. I replaced cam and rocker arms and put a new carb on. What could it be?

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I have 1999 Polaris Sportsman 500. Just replaced the carb, but now it will not start or run. I've adjusted the idle screw, etc. Ideas?