Quantcast
Jump to content

  • Join Today, It's Simple and FREE!

    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.

weblex

Polaris Sportsman 500 '98 engine slows while opening throttle on idle

Recommended Posts

Problem: The ATV starts and runs at idle perfectly. But as soon as I open the throttle, the engine starts to slow down until it stops. On the attached video you can hear the sound of how it works: see video below

Prehistory: there is a Polaris Sportsman 500 1998, which for about 1.5 years stood in repair, including also replacing CDI with one taken from the same ATV. Finally, the vehicles were on wheels, traveled several kilometers and overheated - forgot to fill the antifreeze :) Came back home in small moves. The next trip started well, but after 10 km there was a feeling of a small drop in power (even as the vehicle got warm completely) but still drives. Next trip - the situation is repeated. The next test of ATV through time and a huge loss of power from the very beginning. The engine sneezes, does not want to go more than 5 mph.

What has been done: the carburetor has been replaced with a new one (inexpensive, $ 40), a new spark plug, a new ignition coil, the engine head has been removed, the piston is in good condition, valves were corrected - but the problem was definitely not in them.

Ignition control unit is suspected. Who faced similar? Please help in solving the problem.
Thanks in advance.

 

 

Share this post


Link to post
Share on other sites


I would start by rebuilding the oem carb. Put that back on. The cheap carbs are shit.  Check the gap at the pick up coil as well as test the pick up coil.  How’s the fuel delivery system? Pump or gravity ? 

 

Share this post


Link to post
Share on other sites

Thanks for the answer. I will clarify: the situation with the eom carburetor was very similar, so I think this part can be ignored. Now the fuel goes through a pump from a plastic bottle - there is pressure, the fuel is constantly in the filter.
The situation is very similar to the fact that with an increase in engine speed, the ignition timing does not changes and the fuel explodes before it should, thereby stopping the engine. So yes, I will look now on the pickup coil, hope I had some old one somewhere.

Share this post


Link to post
Share on other sites

Have you tried giving it a little choke while the engine is dying, just to see what happens?

Share this post


Link to post
Share on other sites

Ok, I have checked the pickup coil's resistance and it was almost normal. Then connected the choke as it was disconnected while changing the carb and the picture started to change. On the fully opened choke the engine on idle works fine even on big rpm. Seem this is the problem - will try to configure carb's needle position little later.

  • Like 1

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 oxidized_black
      these are what i have in my collection ... always looking for more
      1985 - 1995 Polaris All Models Service Manual
      http://rapidshare.com/files/313448639/1985%20-%201995%20Polaris%20All%20Models%20Service%20Manual.pdf
      1996 - 1998 Polaris All Models Service Manual
      http://rapidshare.com/files/2566075976/1996%20-%201998%20Polaris%20All%20Models%20Service%20Manual.PDF
      1996 - 2003 Polaris Sportsman & Xplorer 500 Service Manual
      http://rapidshare.com/files/3881296361/1996%20-%202003%20Polaris%20Sportsman%20Xplorer%20500%20Service%20Manual.pdf
      1996 - 2003 Sportsman 400 & 500 ~ Xplorer 500 Service Manual
      http://rapidshare.com/files/1945169405/1996%20-%202003%20Sportsman%20400%20and%20500%20-%20Xplorer%20500%20-%20SM.pdf
      1999 - 2000 Polaris All Models Service Manual
      http://www.2shared.com/file/hCQ5e4ya/1999_-_2000_Polaris_All_Models.html
      2001 Polaris 90 Service Manual
      http://rapidshare.com/files/2430852992/2001%20Polaris%2090%20Service%20Manual.pdf
      2001 Polaris Scrambler 50 ~ 90 Sportsman Service Manual
      http://rapidshare.com/files/2962334993/2001%20Polaris%20Scrambler%2050-90%20Sportsman%20Service%20Manual.pdf
      2001 Polaris Sportsman 500HO Parts Manual
      http://rapidshare.com/files/451418767/2001%20Polaris%20Sportsman%20500%20HO%20Parts%20Manual.pdf
      2001 Polaris Sportsman 500 Parts Manual
      http://rapidshare.com/files/873833713/2001%20Polaris%20Sportsman%20500%20Parts%20Manual.pdf
      2002 - 2003 Polaris Sportsman 600 & 700 Servive Manual
      http://rapidshare.com/files/3750433520/2002%20-%202003%20Polaris%20Sportsman%20600%20700%20Servive%20Manual.pdf
      2002 Polaris Sportsman 700 Service Manual
      http://rapidshare.com/files/4191367160/2002%20Polaris%20Sportsman%20700%20Service%20Manual.pdf
      2003 - 2005 Polaris Magnum 330 Service Manual
      http://rapidshare.com/files/2571512190/2003%20-%202005%20Polaris%20Magnum%20330%20Service%20%20Manual.pdf
      2003 Polaris Predator 500 Service Manual
      http://rapidshare.com/files/1561848060/2003%20Polaris%20Predator%20500%20Service%20Manual.PDF
      2003 Polaris Predator Parts Manual
      http://rapidshare.com/files/4151866252/2003%20Polaris%20Predator%20Parts%20Manual.pdf
      2003 Polaris Trail Blazer 250 Service Manual
      http://rapidshare.com/files/3083170606/2003%20Polaris%20Trail%20Blazer%20250%20Service%20Manual.pdf
      2003 Polaris Trail Boss 330 Service Manual Part I
      http://rapidshare.com/files/3027915922/2003%20Polaris%20Trail%20Boss%20330%20Service%20Manual%20part%20I.pdf
      2003 Polaris Trail Boss 330 Service Manual Part II
      http://rapidshare.com/files/256922404/2003%20Polaris%20Trail%20Boss%20330%20Service%20Manual%20part%20II.pdf
      2003 Polaris Trail Boss 330 Service Manual Part III
      http://rapidshare.com/files/2073509355/2003%20Polaris%20Trail%20Boss%20330%20Service%20Manual%20part%20III.pdf
      2004 Polaris Predator 500 Owner's Manual
      http://rapidshare.com/files/1496658044/2004%20Polaris%20Predator%20500%20Owners%20Manual.pdf
      2004 Polaris Sportsman Owner's Manual
      http://rapidshare.com/files/1871871820/2004%20Polaris%20Sportsman%20Owners%20Manual.pdf
      2005 Polaris 400 & 500 Sportsman Service Manual
      http://rapidshare.com/files/2016732781/2005%20Polaris%20400%20%26%20500%20Sportsman%20Service%20Manual.pdf
      2005 Polaris 700EFI Owner's Manual
      http://rapidshare.com/files/2456466740/2005%20Polaris%20700%20EFI%20Owners%20Manual.pdf
      2005 Polaris 800EFI Owner's Manual
      http://rapidshare.com/files/2541823318/2005%20Polaris%20800%20EFI%20Owners%20Manual.pdf
      2005 Polaris Sportsman 400 Parts Manual
      http://rapidshare.com/files/1380557474/2005%20Polaris%20Sportsman%20400%20Parts%20Manual.pdf
      2005 Polaris Sportsman 500 Parts Manual
      http://rapidshare.com/files/1028019511/2005%20Polaris%20Sportsman%20500%20Parts%20Manual.pdf
      2005 Polaris Sportsman 6x6 Owner's Manual
      http://rapidshare.com/files/1443305840/2005%20Polaris%20Sportsman%206x6%20Owners%20Manual.pdf
      2005 Polaris Sportsman 700EFI & 800EFI Service Manual
      http://rapidshare.com/files/894687742/2005%20Polaris%20Sportsman%20700%20EFI%20%26%20800%20EFI%20Service%20Manual.pdf
      2005 Polaris Sportsman 800 Twin EFI Parts Manual
      http://rapidshare.com/files/3964533984/2005%20Polaris%20Sportsman%20800%20Twin%20EFI%20Parts%20Manual.pdf
      2006 - 2007 Polaris Outlaw 500 Service Manual
      http://rapidshare.com/files/794389275/2006%20-%202007%20Polaris%20Outlaw%20500%20Service%20Manual.pdf
      2007 Polaris 700 800 800x2 EFI Service Manual
      http://rapidshare.com/files/1746547316/2007%20Polaris%20700%20800%20800x2%20EFI%20Service%20Manual.pdf
      2007 Polaris Ranger 700EFI 6x6 Parts Manual
      http://rapidshare.com/files/3154042110/2007%20Polaris%20Ranger%20%20700%20EFI%206X6%20Parts%20Manual.pdf
      2007 Polaris Ranger 700 4x4 & 6x6 Service Manual
      http://rapidshare.com/files/2056243393/2007%20Polaris%20Ranger%20700%204X4%20%26%206X6%20Service%20Manual.pdf
      2007 Polaris Ranger XP 4x4 Service Manual
      http://rapidshare.com/files/2560399291/2007%20Polaris%20Ranger%20XP%204X4%20Service%20Manual.pdf
      2007 Polaris Sportsman 450 & 500EFI - 500X2EFI Service Manual
      http://rapidshare.com/files/362055931/2007%20Polaris%20Sportsman%20450%20-%20500%20EFI%20-%20500%20X2%20EFI%20Service%20Manual.pdf
      2007 Polaris Sportsman 700 800 - 800EFI Service Manual
      http://rapidshare.com/files/1170809762/2007%20Polaris%20Sportsman%20700%20%20800%20%20800%20EFI%20Service%20Manual.pdf
      2008 Polaris Sportsman 500EFI & 500x2 Service Manual
      http://rapidshare.com/files/2660925568/2008%20Polaris%20%20Sportsman%20500EFI%20%26%20500x2%20Service%20Manual.pdf
      2008 Polaris Ranger 6x6 700EFI Parts Manual
      http://rapidshare.com/files/1100934643/2008%20Polaris%20Ranger%206X6%20700%20EFI%20Parts%20Manual.pdf
      2008 Polaris 800 RZR Service Manual
      http://rapidshare.com/files/1643125351/2008%20Polaris%20RZR%20800%20Service%20Manual.pdf
      2008 Polaris Sportsman 700x2 - 800EFI - 800 Touring Service Manual
      http://rapidshare.com/files/2569449145/2008%20Polaris%20Sportsman%20700%20x2-800%20EFI-800%20Touring%20Service%20Manual.pdf
      2009 Polaris 850HD EPS Service Manual
      http://rapidshare.com/files/101425622/2009%20Polaris%20850%20HD%20EPS%20Service%20Manual.pdf
      2009 Polaris Outlaw 450 & 525 Service Manual
      http://rapidshare.com/files/546886376/2009%20Polaris%20Outlaw%20450%20525%20Service%20Manual.pdf
      2009 Polaris Outlaw 90 Service Manual
      http://rapidshare.com/files/2606864818/2009%20Polaris%20Outlaw%2090%20Service%20Manual.pdf
      2009 Polaris Predator 50 Service Manual
      http://rapidshare.com/files/2981515981/2009%20Polaris%20Predator%2050%20Service%20Manual.pdf
      2009 Polaris Ranger 2x4 Service Manual
      http://rapidshare.com/files/2773545106/2009%20Polaris%20Ranger%202X4%20Service%20Manual.pdf
      2009 Polaris Ranger 4x4 Crew Service Manual
      http://rapidshare.com/files/2147064335/2009%20Polaris%20Ranger%204X4%20Crew%20Service%20Manual.pdf
      2009 Polaris Ranger 500 2x4 Service Manual
      http://rapidshare.com/files/3359827457/2009%20Polaris%20Ranger%20500%202x4%20Service%20Manual.pdf
      2009 Polaris Ranger 500EFI 4x4 Service Manual
      http://rapidshare.com/files/1843595183/2009%20Polaris%20Ranger%20500%204X4%20EFI%20Service%20Manual.pdf
      2009 Polaris Ranger 500EFI 4x4 Service Manual
      http://rapidshare.com/files/1843595183/2009%20Polaris%20Ranger%20500%204X4%20EFI%20Service%20Manual.pdf
      2009 Polaris Ranger 700 4x4 Crew Service Manual
      http://rapidshare.com/files/3812850632/2009%20Polaris%20Ranger%20700%204x4%20Crew%20Service%20Manual.pdf
      2009 Polaris Ranger 700 4x4 Service Manual
      http://rapidshare.com/files/3519909971/2009%20Polaris%20Ranger%20700%204x4%20Service%20Manual.pdf
      2009 Polaris Ranger INTL Service Manual
      http://rapidshare.com/files/1791074551/2009%20Polaris%20Ranger%20INTL%20Service%20Manual.pdf
      2009 Polaris Ranger RZR 170 Service Manual
      http://rapidshare.com/files/4144478260/2009%20Polaris%20Ranger%20RZR%20170%20Service%20Manual.pdf
      2009 Polaris Scramber 500 Service Manual
      http://rapidshare.com/files/2919415729/2009%20Polaris%20Scramber%20500%20Service%20Manual.pdf
      2009 Polaris Sportsman 300 & 400HO Service Manual
      http://rapidshare.com/files/2223541478/2009%20Polaris%20Sportsman%20300%20-%20400%20HO%20Service%20Manual.pdf
      2009 Polaris Sportsman 450 & 500X2 Service Manual
      http://rapidshare.com/files/4258047448/2009%20Polaris%20Sportsman%20450%20-%20500%20X2%20Service%20Manual.pdf
      2009 Polaris Sportsman 500 Service Manual
      http://rapidshare.com/files/2664437276/2009%20Polaris%20Sportsman%20500%20Service%20Manual.pdf
      2009 Polaris Sportsman 6x6 800 Service Manual
      http://rapidshare.com/files/3249031777/2009%20Polaris%20Sportsman%206x6%20800%20Service%20Manual.pdf
      2009 Polaris Sportsman 800EFI & 800EFI Service Manual
      http://rapidshare.com/files/1709635527/2009%20Polaris%20Sportsman%20800%20EFI%20-%20X2%20800%20EFI%20Service%20Manual.pdf
      2009 Polaris Sportsman 550XP Service Manual
      http://rapidshare.com/files/402967615/2009%20Polaris%20Sportsman%20XP%20550%20Service%20Manual.pdf
      2009 Polaris Sportsman 850XP Service Manual
      http://rapidshare.com/files/1693558764/2009%20Polaris%20Sportsman%20XP%20850%20Service%20Manual.pdf
      2009 Polaris Trail Boss - Trailblazer 330 Service Manual
      http://rapidshare.com/files/3292152503/2009%20Polaris%20TrailBoss%20Trailblazer%20330%20Service%20Manual.pdf
      2010 Polaris Ranger RZR S Service Manual
      http://rapidshare.com/files/2594957139/2010%20Polaris%20Ranger%20RZR%20S%20Service%20Manual.pdf
      2011 Polaris Ranger RZR S Service Manual
      http://rapidshare.com/files/853949219/2011%20Polaris%20Ranger%20RZR%20S%20Service%20Manual.pdf
      2011 Polaris Ranger RZR SW Service Manual
      http://rapidshare.com/files/907319516/2011%20Polaris%20Ranger%20RZR%20SW%20Service%20Manual.pdf
      2012 Polaris Sportsman 400 Service Manual
      http://rapidshare.com/files/1724946912/2012%20Polaris%20Sportsman%20400%20Service%20Manual.pdf
    • By Paul Maple
      I have a 1999 Sportsman  500, it was running fine, than started to lose power in the winter, I adjusted the idle screw and away I went, than a few weeks ago it died, I have found that i am flooding the engine, compression was at 70PSI and due to the compression release mech. i assume i am good as it compared to the same PSI on a 2000 sportsman 500 i have. i cannot start the atv unless i go full throttle and it starts an runs for about 30 sec than dies, again it is flooded. i ordered a new carb off ebay as i could get one for around $40. put that in same issue, i have checked the timing, (good), valves out of adjustment i adjusted to .006 still same issue, i have found the exhaust lobe and rocker arm to have some wear, i have ordered new ones, but am looking for any other input in this area as well. would the exhaust cam and rocker arm cause the engine to flood? i have used a bore scope and the piston liner has good cross hatching still? any input would be great.
    • By Georgeann Stricklin
      View File 2014 Polaris Sportsman 570 EFI EPS Owners Manual
      2014 Polaris Sportsman 570 EFI and Sportsman 570 EPS Owner's Manual for Maintenance and Safety
      Submitter Georgeann Stricklin Submitted 06/10/2019 Category Polaris ATV  
    • By Christopher Middleton
      I was given a "Go-Kart" its an old Carter brothers dlx150 but the engine is not the same that came with this Kart. I am trying to ID it so i can look at getting some parts for it. the pictures attached are of the motor and the only ID marks on it. I am thinking its some sort of 200cc from the 1980's does anyone have a better Idea? I am really trying to get a rebuild kit for the carburetor. on the carburetor is  Keihin 63 AA YKT

    • By Shane Stump
      Ok guys needs some help asap ready to set this thing on fire..thing would never start valves were tight i adjusted the calves to correct shims on intake n exhaust have plenty of clearance in between cam lobes n shims..problem is i done set tdc about 10 times now its dead on..will not fire one hiccup sprayed gas into carb while cranking n while not all it does is make a loud backfire n some flames come out. Its like valves are tight but  there not.idk how it could be firing wrong with it at tdc. I need help asap
  • Similar Tagged Content

    • By RAYAR
      Something I've noticed with the AWD on/off operation. When AWD switch is in the on position and the AWD light is on (trans engaged), turning the AWD switch off kills the engine. With trans in neutral, AWD light is off, turning switch off does not kill engine. Since I don't have the operators manual yet, I'm wondering if this is normal operation?
      Thanks, Ray
    • By Georgeann Stricklin
      View File 2014 Polaris Sportsman 570 EFI EPS Owners Manual
      2014 Polaris Sportsman 570 EFI and Sportsman 570 EPS Owner's Manual for Maintenance and Safety
      Submitter Georgeann Stricklin Submitted 06/10/2019 Category Polaris ATV  
    • By Georgeann Stricklin
      2014 Polaris Sportsman 570 EFI and Sportsman 570 EPS Owner's Manual for Maintenance and Safety
    • By Paul Maple
      I have a 1999 Sportsman  500, it was running fine, than started to lose power in the winter, I adjusted the idle screw and away I went, than a few weeks ago it died, I have found that i am flooding the engine, compression was at 70PSI and due to the compression release mech. i assume i am good as it compared to the same PSI on a 2000 sportsman 500 i have. i cannot start the atv unless i go full throttle and it starts an runs for about 30 sec than dies, again it is flooded. i ordered a new carb off ebay as i could get one for around $40. put that in same issue, i have checked the timing, (good), valves out of adjustment i adjusted to .006 still same issue, i have found the exhaust lobe and rocker arm to have some wear, i have ordered new ones, but am looking for any other input in this area as well. would the exhaust cam and rocker arm cause the engine to flood? i have used a bore scope and the piston liner has good cross hatching still? any input would be great.
    • By Ashton Crawford
      Hello everyone, i have 2000 Polaris Trail Blazer 300 I’ve been stumped on for weeks. I’m having a lot of issues starting the quad. I cleaned the carb spotless because I thought it was a carb issue and bought a new fuel line because it wasn’t getting fuel. The carb gets fuel perfectly fine now but it won’t start. The spark plug I a little worn out but it’s good enough for just one start. The only time it does “start” is when I spray starter fluid into the carb. But it never stays on. It’ll start for a bout a second then just die out immediately even if you’re giving it some throttle and the choke is on. I have no clue what I should do. If you need more information, have questions, or have any slight idea what the issue would be and how I could resolve it. Please reply ASAP. Thank you.
  • Recently Browsing   0 members

    No registered users viewing this page.


×
×
  • Create New...