You should be able to just pull the plug and hold the outer part against the engine block and crank the engine to see if you're getting a spark.
In my experience (15 years out of date), the ignition system was pretty finicky on most 'skis. I'd start there also.
Check the four basics (Air, Fuel, Compression, Spark) and you should be able to at least get it to chug a bit. At least if you get it that far when you take it to a mechanic you'll have eliminated 1/2 the diagnosis effort...
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