First of all, double check you have your kill switch up and the key in ignition. (I have spend useless hours tinkering with my sled trying to get spark.... And the key wasn't in) if nothing try disconnecting as many connectors as you can get your hands on, clean off any corrosion and reassemble with dielectric grease. Be sure to inspect the connectors too. Any loose, chewed through, or spliced wires are almost always the culprits. Hardware like the stator, cdi, coil, etc don't just stop working like that. And as a last resort, replace plugs. A tool I would invest in is a spark tester. The old trick of placing the plug on the head works great but not always. Go on harbor freight tools site and order a tester. Worth every cent.
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2003 arctic cat zl550 (looking to sell)