Question about Polaris ATV

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I HAVE A 1999 POLARIS 335 SPORTSMAN STARTS FINE WHEN I TRY TO ACCELERATE THE QUAD BOGS FEELS LIKE ITS GOING TO STALL BUT THEN GOES BUT NOT AT FULL POWER AFTER RELEASING GAS THERE IS A LOUD BACKFIRE THIS HAPPENS ALLOT . WHEN I CK THE SPARK PLUG IT IS FULL OF CARBON WHEN I REPLACE WITH A NEW PLUG IT RUNS GREAT UNTIL THE PLUGE IS FULL OF CARBON AGAIN PLEASE HELP I AM GOING ON A HUNTING TRIP IN A FEW DAYS JUST ONE BACKFIRE AND MY HUNTING DAY WILL BE OVER BEFOR IT STARTS. THANK YOU BOOBY

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  • Steve P
    Steve P May 30, 2017

    Ok.. First.. Clean and treat (or replace)the air filter.
    The carbon build up is indicative of the needle jet/jet needle being worn past its specifications. This is the needle in the center of the slide AND the jet (brass piece) that the needle goes down into. They are a matched pair!!! - commonly referred to as a "brass kit".
    DO NOT purchase an aftermarket rebuild kit!!!!
    This is an easy fix for a GOOD mechanic.. not so for a backyard tinkerer!!! Take it to someone that KNOWS what they are doing. A good carb cleaning and setting will go along with this "brass kit" replacement. This should take care of your problem!!

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  • Polaris Master
  • 44,391 Answers

Carbon on the plugs indicates flooding
the backfire indicates fuel being ignited in the exhaust
have the carby /fuel system professionally overhauled

Posted on May 27, 2017

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Posted on Jan 02, 2017

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  • 93 Answers

SOURCE: Polaris Sportsman 90 - stalls

Is the choke in the on position? Have you warmed it up enough?

Posted on Sep 11, 2009

  • 12650 Answers

SOURCE: I have a 1999 polaris sportsman 335 atv and I am

carb needs work possible float or fuel/air mix valve worn

Posted on Mar 07, 2010

  • 1 Answer

SOURCE: 2004 polaris sportsman 700 main Fuse?

Can i get a wiring diagram for a 2004 polaris sportsman 500 H.O. i get no powere anywhere. lholloway@lexington4.net

Posted on Mar 23, 2010

  • 12650 Answers

SOURCE: atv stalls at about 40 to 50 miles per hour .let

check air filter-and may need to clean and adjust carb

Posted on Apr 26, 2010

  • 1 Answer

SOURCE: Service manual for a 2006 500 Polaris Sportsman HO

I have a 2006 Sportstman 500HO ATV, EFI. Sometimes it will run 100% correct, other times it will start, idle fine but then when giving it throttle will will start to surge almost like it's hitting a rev limited. Sometimes it will backfire and stall. I already replaced fuel filter, flushed the fuel lines and gave it fresh gas and installed a new spark plug, but no good. I also checked the throttle switch and it's not making contact to stall it. I download the service manaul and tested each sensor and they tested fine which is probablt why I get no check engine light.
This ATV is mainly used to plow snow in my driveway, no salt. It's used around my property but very lightly. It's still as clean as it was when I bought it and it doesn't have but about 40 hours on it.
Polaris 500 HO EFI 4x4 ATV: Vin# 4XAMH50A56B707664 purchased 6-8-2006

gtopercy@comcast.net

Posted on Jul 15, 2010

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