Quantcast
Jump to content

  • Do you own an ATV? Join our Forum!

    As a member, you can post in our forums, upload your photos and videos, use and contribute to our downloads, create your own member page, add your ATV events, and even start your own ATV club to host your own club forum and gallery.  Registration is fast and you can even login with social network accounts to sync your profiles and content.

oliverstevenrjr

Polaris Magnum 425 idles fine, runs terrible

Recommended Posts

I have a 425 Magnum that idles great but seems to flood out when I rev it up, sputters, backfires a little somtimes. No water in gas, good fuel filter, carb seems to be fine, good working diaphram. Plug change makes no difference whatsoever.

Share this post


Link to post
Share on other sites


Is your choke working properly?

* Updated your thread title with manufacturer name.

Share this post


Link to post
Share on other sites

Friend

i dont know how this website works, probably never find out

i just printed this on another message

hope i can help

o.k. So it sputters and backfires, but, how the plug looks like when you change it?

This sparkplug description means a lot when working on engines and dont see it front and personal.

First, quick repair

check yar throttle cable for slack, too much is bad

eaven if it is ok, i whould recommend to open the throttle case, there is an electrical gizmo, little switch it is.

Dont remember very good, but i think the switch should remain close if you give gas, or not give gas

fire your bike

give it gas and see the switch action

you can close it by hand and may get a different output

now you may find out if and how set an adjustment for this cable

if not..

Well

more info.,.

And probably carb time..

Let me know

ps did you check for mice condominiums on the air filter box?

Did you store or did not use your bike for some time? For this one is easy

Share this post


Link to post
Share on other sites


Check the air filter, timing, valve lash, timing chain/tensioner and the inside of the carb. If it has not been run for a while, then the old gas in the carb could have gummed up. Check to see if it runs better with the choke on or off.

Share this post


Link to post
Share on other sites

No offense, but it probably runs poorly becasue polaris produces crap for the most part. Thier new 09 sportmans are much better, older ones are nothing but problems, get it running well and then sell the thing and get a quailty machine! yamaha, honda, suzuki, kawi or can am.

Share this post


Link to post
Share on other sites

PLEASE NO BRAND BASHING. if you dont have anything nice to say about Polaris or any other brand for that matter dont say it.

on another note Welcome to QuadCrazy

Share this post


Link to post
Share on other sites

Yamaha, I will re-enforce what Outlander said, there is no need to tell anyone that their ATV is crap. I have known several people who have owned Polaris ATV's and been completely satisfied with them.

Kyle, if you are having the same problems, I would take the same advise that the last guy was given, have you checked your air cleaner?

Share this post


Link to post
Share on other sites


oliverstevenrjr, how are you making out with this? What year is that 425?

Share this post


Link to post
Share on other sites

I have a 98 magnum 425 and have had similar problems. Next time it starts doing this, hold the yellow override button and see if this fixes it. works every time on mine

Share this post


Link to post
Share on other sites
I have a 425 Magnum that idles great but seems to flood out when I rev it up, sputters, backfires a little somtimes. No water in gas, good fuel filter, carb seems to be fine, good working diaphram. Plug change makes no difference whatsoever.

A gummed up carb does sound the most plausable it may sound like its getting too much gas when in fact its getting to little. Also the machine needs good air flow to run properly change the air filter. Do a compression check to check valve seat also. More tech tips at atvwheelin.com in the tech tips.

Share this post


Link to post
Share on other sites

Take the air cleaner off, rev it up and see if gas is seeping into the air box. If so, your float is stuck or your needle isn't seating properly. Polaris doesn't offer a " carb rebuild kit " for my 95 425 Magnum ... you have to buy the individual parts and peices.

Share this post


Link to post
Share on other sites

I just couldn't pass up this 98 Polaris with the automatic transmission , snow plow , brand new tires and brand new wench for $300 , he ran it a week before I got it , then it wouldn't start , I changed the stater and it idles with choke on , will not with it off , gotta really work the throttle back n forth fast to keep it running , it's got no smoke in the exhaust , so I'm thinking carb problems ? So far there's a lot of good tips here , great stuff guys thanks any good starting point , other than that yellow switch deal , I gonna try that next , already cleaned the filter n stuff , H E L P  !!!! 😂🤣😎

Edited by Chris Ryder

Share this post


Link to post
Share on other sites


Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Similar Topics

    • By dirtjunkie85
      Just wanted everyones opinon on riding glove I do long desert races and none of the glove i have wore seem to hold up really good they always wear fast and dont do much to prevent blisters any advice thanks.
    • By Admin
      We would like to wish everyone a Fantastic Memorial Day Weekend!


      SUPPORT OUR TROOPS!




    • By wwdubose
      I have two 2003 Suzuki Ozark 250s, both 2-wheel drive.  Last time we rode them about a year ago, the red one was not running well, didn't want to idle, backfired a lot.  The green one ran fine. 
      Fast forward...I ordered a carb kit for both of them, thinking the red one has some trash in a jet.  Both of these ATVs have had little use and I've always ran the gas out after use (put an inline cutoff valve in gas line).  I pull started the red one to verify it was still running bad.  It will start and idle, but as soon as you give it any throttle, it dies instantly.  Give it a little choke, dies instantly.  Took the carb apart and it was spotless.  Went ahead and cleaned all the holes with carb cleaner and blew everything out with compressed air.  All new jets, main jet holder, and needles.  Put it back on and nothing changed.  Starts, idles (not for a long time), but dies as soon as you give it gas.  Same happens when you put the choke on.  It does the same thing when I try to run it turned to prime on the petcock as it does in the on position.
      Not an air filter issue.  It is clean and it does the same exact thing with no filter on it.
      Thought maybe there was a float issue or maybe a damaged diaphragm, so I took the carb off the green Ozark and put it on red.  Started up and initially ran normal and revved for about 10 seconds and then started doing the same exact thing.  Starts, idles (not for a long time), but dies as soon as you give it gas.  Same happens when you put the choke on. 
      So...not the carb
      Thought maybe vacuum petcock was bad, but there's no gas in the vacuum line going from petcock to carb and gas flows freely when on prime.  I even plugged the vacuum line at both the petcock and carb end and tried to run it with valve set to prime.  Gas flows freely, but does exactly the same thing.  I unscrewed the screw at the bottom of the bowl and gas flows thru carb and out bowl drain line when petcock is set to prime.
      So, I'm assuming petcock is good?
      Checked spark plug and it wasn't fouled.  Reset gap, didn't help.  Will swap plugs between Ozarks tomorrow but I don't think that is it.
      Anyway, that he history and now you're all caught up.  Scratching my head.  Valves? These were bought at same time and have had little use.  Suggestions?
      Thanks!   
    • By Dra O
      posted a while back - it was running at one point - I have all the plastic shroud off - it's down to frame and engine now
      -fuel pump: when line from petcock is attached, no fuel comes out other side to carb; the line to the carb is open (can blow through it); I thought when I cranked engine that the pump would spit out fuel on other side but it does not; I removed fuel pump and opened it up - diaphragm looks good - but internal areas had lotsa calcification build up - I cleaned this out and dried it good - the clear plastic pieces (?diaphragms) aren't broken - the spring w/ steel ball on end moves freely; am putting it back on tomorrow; but can anyone answer about the pump? isn't it supposed to pump fuel through it... to other side... to carb? puzzling
      -along with fuel pump: I replaced petcock 3 weeks ago (gas tank had rusty fuel in bottom - cleaned it out prior to new petcock); when I turn petcock arrow NOT to on or reserve, fuel comes out of line; when I turn it to on or reserve, fuel doesn't come out; puzzling
      -I don't know what's on back of fuel pump - it's a valve that has a hose coming out of it - looks like it goes to engine/carb - I haven't traced this out yet - what is it?
      -can squirt gas on air filter and engine will run for 2-3 seconds then stop - fuel in top of carb (under diaphragm) does same
      -it likely needs carb rebuild - will get to this - but something isn't allowing fuel to get from fuel pump to carb
      -I THINK it has a mikuni model x carb - diaphragm is ID 26mm  OD 68mm - hard to find inexpensive diaphragm, I guess because it's a model x
      -last thing - I replaced solenoid due to old one clicking; I HAVE to be charging the battery or it won't start/turn over - battery just goes dead; but if charging, it'll turn over nicely; i'm guessing it's a bad battery
      -any help appreciated - I've never owned an ATV before - inherited this beast from grandparent in-law
  • Recently Browsing   0 members

    No registered users viewing this page.


×
×
  • Create New...