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We replaced the ignition kit on our 2003 polaris sportsman atv. It is better than it was only because it will start now. Followed enclosed instructions that came with the ignition kit. Machine will now start, idle and move, but when you give it gas it runs very unsteady and starts missing. New plugs have been installed, drained carborator. ?
 

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your symptoms sound like a carb issue to me, either stuck float(not enough fuel), or a clogged jet. I would pull the carb and clean it well, and check your float to make sure it is adjusted properly. There are plenty of rebuild kits available on ebay that are inexpensive and easy to do.
 

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When you took the carb off, did you have to drain the bowl(was it full?). The only reason i suggested carb was that I had the same backfire problem with my 700, and the issue was the float adjustment, it was starved for fuel.
 

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So I guess next i would check the coil, but I've not had to check one of those on my machine, so I wouldn't be a good source of info on that. There might be someone on the forum who is better versed in the electrical aspect of the ignition system, have you searched the forum for other posts with a similar problem?
 

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the spark plug boots have resisters in them...and can go bad...did you have a faulty ignition before and had to get a new kit...if so may have damaged the resisters in the plug boots..its a shot in the dark ..I think they unscrew off the wire..if so unscrew and check the ohms to see if in spec...not sure off hand what the reading is suppose to be..manual out in garage...
 
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