2004 Polaris Magnum 330 - Carb Issues

3 posts in this topic

Carb issues help?

I just rebuilt the carb on my '04 Magnum 330. It's a Mikuni 34mm CV carb.

I got the rebuild kit from my local Polaris dealer. I also got 8' of 1/4" fuel line and a new in-line filter. I drained/cleaned the fuel tank and the fuel is now for the lawn mower. All of the fuel lines were replaced from the tank to the petcock, to the fuel pump, and to the carb. I even replaced the vacuum line from the carb to the fuel pump. New in-line filters installed. Fresh fuel in the tank.

The carb kit had replacement parts for everything except the pilot screw/needle. I checked the float settings when I rebuilt it. I clipped the needle at 3 of 5, just like when I tore it down (factory setting). I cleaned the pilot screw, and reinstalled to two turns out from bottom.

I was able to get it started w/o any problems, and it idles perfect (got lucky). But I haven't adjusted the pilot screw.

Now my problem. I start up, closed the choke, and idles fine. BUT, if I try to give it gas it starts to stumble. I tried to give it wide open throttle, and it died. I can restart it and it runs fine at idle. I haven't tried driving it yet since I still have the front end tore apart.

Any thoughts? I can get to the needle easy enough, but it's clipped at the same setting as I tore it apart at, and where it's been running fine since I bought it.

Thanks in advance,


St Louis, MO

Share this post

Link to post
Share on other sites

Go to the Polaris ATV forum look for the sticky notes in regard to a 2004 Polaris Magnum 330 service manual. That manual might tell you how to adjust the pilot screw and much more. However if it doesn't many Polaris delaers may answer that question for you for free, it never hurts to ask. Hope This Helps, Whip

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Similar Content

    • By Wonderwoman
      Hello, well back to where I was last year with this carb. Took my 250 to the mountains for the first time this year and blue smoke, too much gas again. I can't believe that this carb gives me this much trouble. Seems like the choke is stuck but the cable moves freely. Anyone else ever experience this issue? Do you think a new choke cable would maybe resolve this?http://www.quadcrazy.com/atvforum/images/smilies/arghh.gif
      OK it was the choke. Put on all new cable and plunger and she is running 100% again. So now the question is, is the carb getting worn out where the plunger needle goes in the small hole and when I use the choke the needle end doesn't get lined back up with the hole?? We'll see how it runs and now that I know what the issue is I can always pull the choke plunger out and reinstall if I start having this issue again.
    • By ut1w7b
      I have a 94 sportsman 400. It sat for several years before i got it. I have cleaned the carb it will start and run for about 5 min then it will flood. I have torn it down and cant see anything wrong. has anyone else ran into this problem any hel would be great.
    • By ej200421
      i was wondering if i could get some help. i been trying to locate where the fuel and air adjustment screws are located on my 95 kodiak 400. i think i found the fuel screw.. i know where the throttle adjuster is but i cant find the air screw. or is there an air adjustment on these carbs?
    • By Racer944
      Hi Folks;
      Has anybody on here installed a winch on a 2003 Magnum 2x4? I am using a Cycle Country adapter plate (only one I could find), but am having a bit of trouble getting it all to fit properly, and am looking for someone that may have done this install and/or may have some pics of the installation.