Check the gas in the fuel tank for any water. Water in the tank runs through the engine and causes persistent backfiring. Old fuel can also cause this problem, as well. Remove the old or tainted fuel and replace with new fuel. Start your snowmobile again to see whether the backfiring persists.
Polaris offers a number of snowmobiles that the avid rider can take out to the snow, suiting just about any need or personal specification. Just like any other snowmobile though, Polaris snowmobiles are susceptible to certain problems, including engine backfiring. Fortunately, you can solve engine backfiring by conducting a series of troubleshooting inspections to get to the bottom of the matter. Often, you can eliminate the problem with a few inexpensive alterations.
Inspect the exhaust pipe for any cracks, holes or other damage that can produce a leak. This type of damage causes intermittent backfiring. Depending on the severity of the damage, either seal the damage or you may need to have the entire pipe replaced. Take your Polaris snowmobile into a mechanic or specialist for inspection to make a final determination.
Inspect the flywheel key, a small metal piece at the bottom of the crankshaft, to make sure it has no damage. The flywheel key is an integral part of the snowmobile's timing. Often, the flywheel can sheer off after intense usage. This, in turn, impedes the timing of the snowmobile and causes backfiring.
Look at the spark plugs to make sure they are in working condition. A dust-like or powdery buildup around the sparks indicates a problem and may necessitate the need for replacement. Old spark plugs do not fire correctly all the time, causing the snowmobile to backfire. Replace all spark plugs that appear to have a dusty or powder-like buildup.
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