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Polaris fuel filters are usually in the fuel line coming from the valve that turns fuel off. This model does not seem to have an inline filter, however you can always buy a universal one and splice it into the line so that then it does have one
If you are certain the spark plug(s) is in good condition and correctly gapped, and the magneto is working normally, then you may have a fuel system problem. A quick diagnosis of fuel system issues is to spray a shot of starter fluid or WD-40 into the intake through the throttle body. If the engine fires for a bit then quits, it's a fuel system issue. Small engines do not do well with old ethanol-containing fuel. If it's turned yellow, drain it out and replace it, and remove any in the carburetor float bowl also.
Air leaks in the carburetor or intake manifold gasket may also cause hard starting. A sticky carburetor float or float valve is another possibility, especially if the engine was sitting for a long time with ethanol fuel drying out in the float bowl. A dirty air filter will also cause starting issues.
Sounds like one of the wires on the loom might have come undone, just run through the loom, especially all the wires to the ignition.If that fails, looking at the model, could potentially be a CDI failure. Good luck