To troubleshoot a Polaris snowmobile, identify the specific problem, such as blocked fuel lines or an engine that does not start. Faulty spark plugs are another common problem with Polaris snowmobiles.
The engine's fuel supply is a good place to start checking. If the fuel tank has contaminated fuel, drain it, and refill the tank with fresh fuel. Since old gas causes blockage in the fuel line, ensure you drain the fuel tank after a season's use. A blocked fuel line prevents the engine from starting even when it turns over.
Inspect the fuel line, which runs from the tank to the engine, and ensure it is clean, secure and unbroken. The fuel line is usually clear, so any blockage should be obvious. If the line is clogged, thoroughly clean it using isopropyl alcohol. If it is damaged, replace it.
If the engine doesn't start, the spark plugs may be responsible. Remove each spark plug from the engine's cylinders, and inspect each plug's insulator tip. Replace every spark plug whose insulator tip is damaged or burnt. If necessary, set the spark plug gap to the correct width.
If the engine continues to have mechanical problems, take it to a certified dealer for repairs.