The ignition coil is what sends the spark to the spark plug which, in turn, ignites the fuel in the combustion chamber and allows for the engine to make power. This is the case for any petroleum-fueled internal combustion engine. When an ignition coil goes bad or fails completely, the associated problems can manifest themselves in a slew of drivability problems: rough idle, sputtering, uneven flow of power, difficulty starting or hard starting, misfiring, backfiring, loss of fuel economy, and--the most telling sign--loss of power. Ignition coils in cars are typically shielded from the environments because the engine is enclosed under the hood or inside the vehicle (in mid-engine or rear-engine cars). Snowmobiles, in comparison, typically see less use than everyday cars and trucks and are primarily subjected to freezing temperatures, snow, slush, and all the harshness of Winter that can be brutal for an electrical system. If you suspect that your ignition coil has gone bad or has died, regardless of whether it came from age or from environmental damage, it can easily be replaced. HQ Powersports is an online retailer of brand new, OEM-spec aftermarket replacement parts for recreational and utility powersports vehicles. We carry replacement ignition coils for Ski-Doo snowmobiles.