Testing your ignition coils with a multimeter gives results outside of the secondary resistance parameters indicated in your manufacturer specifications. 
Carboned plugs flood the carburetor and point towards a faulty CDI box. A cooked battery can usually be traced back to a defective rectifier/regulator. If this doesn’t change anything, then consider it a symptom. Frayed wires or loose spade connectors can typically be remedied with a little pinch and some dielectric grease. Ignition leads will shorten if you spray a bottle of water on them. A bad CDI won’t fire at all since everything goes through the box to fire the motor. The below signs can help you determine if the problem is from the CDI box: When a Polaris Sportsman 500 idles but dies, it can point to different things, such as misfires, starting issues, rough running, and even a stalling motor. What Are the Symptoms of Bad Polaris CDI Box? Depending on the ATV’s make and model, the CDI box configuration can differ and control other things aside from what was mentioned. Typically, it controls the factory safety kill switches, timing, the spark, and the rev limiter. The rectifier found inside the charging circuit stops capacitor-discharge before the moment of ignition. What Is Inside a CDI Box?Ī typical Capacitor Discharge Ignition box consists of a small transformer, a triggering circuit, a charging circuit, and the main capacitor. Keep reading to learn more about this problem, and other things you can try if replacing the CDI box doesn’t help. This can be a frustrating issue, especially if you don’t know why it happens. Polaris Sportsman 500 Dies When Accelerating However, many have discovered the cause of the problem to be electrical – more specifically, the CDI box. Most people would first think the issue relates to the carburetor, which controls fuel and air entering a motor. Replacing it with a Polaris CDI box should fix the problem. The reason the Polaris Sportsman 500 dies when accelerating often comes from the CDI box, which is used to pass electrical current to the spark plug and ignite the engine. 
So, you may be wondering why your Polaris Sportsman 500 dies when accelerating. You may have tried everything, such as replacing the carb or even the entire engine. But there’s one issue preventing you from riding this aggressive 4×4 – it dies when accelerating. The Polaris Sportsman 500 is a serious trail quad, offering lots of power and good traction.
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