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donerightautomotive84

2000 Polaris Sportsman 500 wont stay running

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Ok so 2000 sportsman new.caltric carb new fuel pump new jug and piston new cdi and coil finally get to start it and itll idep for 5 to 10 seconds and die what am i missing people any help id love ya forever lol

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I'd start by connecting an inline spark tester to it so you can watch ignition while it's running. When the engine quits, so you still have spark? If so, then it's on to checking out the fuel system.

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I do have an inline spark tester and will check that out this weekend as its currently pulled apart again i went ahead and prdered a fuel valve (old one had just started leaking right after i originally posted) and another fuel pump both will be here friday abd my buddy has a brand new caltric carb im going to put on it at the same time so hopefully i can rule the fuel system out all together. Im also cleaning my tank and the pickups in it at same time hopefully all works after. Ive tested the etc and its working right so im pretty sure its not the problem.

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Could also be timing.  If the timing is off just right it'll fire on the exhaust stroke and seem to run when in fact it's really only exploding and not running correctly.

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If it had bad fuel lines, that could make things worse alright. If they disintegrate then there might be more crud in the carb you just replaced/cleaned.

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Sounds fuel related. Too much or too little fuel to keep it going. You would smell the gas if it was too much, my guess its too little. I would add a clear fuel filter before the carb to see if any debris may be getting to and clogging up the carb. Takes very little to cause a lot of headache...

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Ok f
Cleaned the carb oyt didnt really find anything concerning reassembled it no change. Choke doesnt change the lebgth of time it runs. Am i missing somekind of sensor or switch that could be causing this.

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