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.


1996 Polaris Magnum 425 won't go over 1/3 throttle

Recommended Posts

I've been reading through these forums for about two weeks looking into the issue I am having with my 425 Magnum and have tried everything I have seen but nothing has fixed my issue. Basically, I picked this 4wheeler up knowing it would idle perfect but would not rev past 1/3 throttle. I figured it was a Carb issue but after looking at that realize it is not. I have replaced the Cam and Rockers, again not the problem. I finally took the air box completely off and noticed that the hose going to the airbox was wrinkle inside and possibly letting air in. I figured I would permatex it up as a temp fix before purchasing that. Well, while it was setting up over night, I decided to run the bike. It ran damn good. It would rev to full throttle even though it was sputtering which I attributed to the lack of vacuum line being connect due to the air box being off. Anywho, I put the air box back on when I got home from work thinking I found the issue and the thing is back running the way it was before. The engine doesn't completely die it just struggles to stay firing. I have also already tried disconnecting the rev limiter (black wire) but got the same results. Does anyone have any other ideas before I take this thing down the road and run it into the Quarry?!?!?!? :aargh:


Share this post

Link to post
Share on other sites

Welcome to QUADCRAZY! So you said you looked at the carb, right? You made sure the float is fully operational? Sounds like fuel flow to me or shortage of, at high rpm.

Have you checked your stator output at higher rpm?

* Added full year and manufacturer to thread title, condensed title.

Share this post

Link to post
Share on other sites

Right, I'd also lean towards the carb. Did you do a complete rebuild? Soak it over night etc...sounds fuel starved, like a filter or along that line.

Share this post

Link to post
Share on other sites

Have you checked the choke adjustment. MY Daughters quad about made me crazy and it was cracks in the fuel line at idle it was fine hit the throttle and it was like you were running out of gas.

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.

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 pablo Blake
      Its in pretty rough shape and its gonna be my first atv, I worked on bikes before but nothing to do with quads. Anyways the quad has some problems and im tryna figure out what to focus on first. So the U joints i think are shot. The bike starts first try every time ussually have to give it a lil gas with the throttle and revs right up, idles fine but its running REALLY rich 3 starts and my brand new plug was pitch black

      Bike is L model


      Its using the original mikuni carb but im not the best at fixing the carbs and wondering if there is anywhere online that would be able to either walk me through it or help me with it i didnt see a air mixture screw so it seems like im gonna half to open it up and adjust like the float and a couple other things
    • By Lellwyn Griffin
      I think my rear brakes are stuck.  Is these parts in the right position?  Any idea how I repair?  I have to give it more gas to go and I can't push it when it's in neutral.  

    • By Steve Stahlschmidt
      Will not start with out a shot of ether then only runs until it's burnt! Replaced fuel pump, carb, fuel filter, fuel shut off, new plug! I'm lost now! Could it have a bad coil? prior to this it would start and run fine!
    • By Steve Howard
      Ran find shut down the quad next day would start and idle when you try to accelerate it would start popping through the carb got a rebuild kit soaked it in chem clean after break down for 12 hours on slow vibrate reassembled and adjusted per manual still the same thing any help would be really appreciated thanks and happy ridding  
    • By KotaGman
      My bear big fires up with the pull start fairly easy. My electric start worked fine but now doesn’t even try. I bought a new battery and the same. The odd thing is, when I start it up at times, the neutral or reverse light will light up at times... depending on if it’s in neutral or reverse of course... wondering if anyone knows where I should replace? 
  • Similar Tagged Content

    • By Beb1041
      Looking for a download of a manual
    • 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.
    • By warkcol
      I am having an issue where it sounds like the gears are slipping if I hit the throttle really hard and also after letting off when the engine brake is applied. Also, the drive train that goes to the front also rides again the gear shift box. I will attach pictures and a video here shortly.
      Thanks in advance!
    • By Weldingrod47
      Trying to change front wheel bearings. I removed the cotter pin and castle nut. Hub won't budge. Is there an additional retaining clip? Seems to be one of those push on type that barbs on the thread of the spindle. How do I remove it?
    • By buzzar56
      I am looking for a free repair manual for a 2003 Polaris sportsman 500 ho atv. all the posts on here lead me noplace
      thanks fred.
  • Recently Browsing   0 members

    No registered users viewing this page.

  • Create New...