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97' 425 polaris quad,engine bog/lack of power

Looking for assistance with repairs to 97', 425, polaris magnum quad,plowing snow last winter engine developed no power during use, idle fine, engine bog @ wide open throttle, bog begins @ about 1/4 throttle, (not a miss or derate associated with a ign limiter),drained fuel,checked air cleaner ele,repl fuel filter,checked fuel,vent,pulse lines,checked plug condition(very tip of electrode white),repl plug,checked coil and secondary wire/cap resistance,remove carb, remove jets,seats clean ports,inspect float condition,adj float level,confirm needle seat seal,install carb,check intake ducting, no change, starts fine,idles fine, engine revs(no load) to about 1/4 throttle then bog starts(not a miss,rather a engine labour),continue checking cdi connections,harness connections,pulled flywheel checked key condtion,pulser coil adjustment,flywheel condition, any suggestions would be appreciated.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: 97 Polaris Xplorer 500 4X4 rev problem

REPLACE THE CAMSHAFT !!!,,, HAVE A LOOK AT CAMSHAFT , EXHAUST LOBE IS PROBABLY WORE RIGHT OFF....

Posted on Nov 13, 2009

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  • 123 Answers

SOURCE: 97 polaris 500 sportsman 4x4 atv carburetor

If you have gone through the carburetor and your atv still won't rev it sounds like the exhaust lobe on the camshaft is going flat. They have an overhead camshaft in the 500 motor and the exhaust lobes seem to wear down if the oil is broken down (gas in oil) or if the wrong oil is used. Easy way to tell is to remove the 8 screws on valve cover and the spark plug. Then remove the 4 screws holding down the rocker arms. Once the rocker arms are removed you can see the camshaft, pull on the recoil rope to rotate engine until the lobes are facing upward. The two outer lobes are the intake lobes, and the center is the exhaust lobe. If the exhaust is worn, you will definitely be able to tell because it should be about the same height as the intake. Or if you don't feel comfortable doing that I would recommend a reputable repair shop. Hope this helps, and if you need more help let me know, Daniel.

Posted on Sep 30, 2011

s_gamingcent
  • 8 Answers

SOURCE: My 2007 polaris 450 sportsman used to start with the pull start 2nd pull,now it starts for a couple seconds and stalls ,does this three or 4 x then starts and runs fine,by the way it won't start with

Could be time to replace battery, this is most likely the culprit. These fourwheelers are very picky when it comes to low power. Your starter is also most likely just fine, the clicking you hear is the solenoid on the starter, so your battery has some juice, but not enough amps to turn over the starter. Also If the fourwheeler has sat for a long time then you may just need to charge the battery. The 2007 is most likely fuel inject which uses even more fuel when running and it also has its own computer kind of like a PCM in a car or truck. These all need a good supply of power and the stator which is like an alternator usually needs the help of a fully charged battery to keep everything running properly. Also note, once you get a new battery or charge it in some cases the ATV should run smoother.

Posted on Oct 19, 2014

  • 12 Answers

SOURCE: what do I need to check

Oil level good ? Fins on head clean? Or could be electic componets braking down due to heat start with checking resistance at primary coil

Posted on Feb 22, 2015

playercardzr
  • 5 Answers

SOURCE: How do I fix my front wheel drive system on my 2004 ATV 400 Sportsman Late model? After extensive work and parts replacement my all wheel drive is not working.

I have battled with my 4wd, did many of the same parts changes you did. Put it in the garage and was about to tear it all apart, and I brushed against the red kill switch on the left handlebar, and the 4wd icon on the dash lit up, and everything worked! There is a little dead spot in the switch, and if it isn't clicked right in the middle, AWD doesn't work. Once I figured this out, it works great! Hope it's as simple as that for someone else!

Posted on Mar 17, 2015

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