What to do if my Polaris Sportsman 550 EFI Offroad Vehicle engine runs irregularly, stalls, or misfires?
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Melissa CampbellAug 12, 2025
If your Polaris Offroad Vehicle engine runs irregularly, stalls, or misfires, begin by inspecting, cleaning, and/or replacing fouled or defective spark plugs. Check and tighten any loose ignition connections. Replace fuel if water is present or if it's the incorrect type. Recharge a low battery to 12.8 VDC. Inspect and replace any kinked or plugged fuel tank vent lines. Inspect and clean or replace a clogged air filter. If you are using low octane or very high octane fuel, replace with recommended fuel. Allow engine to warm up before operating and/or stopping. If the fuel is low or contaminated, add or change fuel and clean the fuel system.
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Lawrence CraneAug 16, 2025
Why does my Polaris Sportsman 550 EFI engine stop or lose power?
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Jesus TrujilloAug 16, 2025
Your Polaris Offroad Vehicle engine may stop or lose power due to several reasons. Check if you're out of fuel and refuel if necessary, cycling the key to the ON position three times for 5 seconds each. Inspect and replace any kinked or plugged fuel vent lines. Replace the fuel if water is present or if it's incorrect. Inspect, clean, and/or replace fouled or defective spark plugs. Check and tighten any loose ignition connections. Recharge the battery if the voltage is low. Ensure you are using the correct fuel. Inspect and clean or replace a clogged air filter. Clean radiator screen and core, clean engine exterior if the engine is overheated.
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Jason HaasAug 20, 2025
What to do if my Polaris Sportsman 550 EFI engine turns over but fails to start?
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Erin HayesAug 20, 2025
If your Polaris Offroad Vehicle engine turns over but doesn't start, first, refuel if you're out of fuel, cycling the key to the ON position three times for 5 seconds each. Inspect plugs, verify stop switch is on. Inspect plugs and replace if necessary if fouled or defective. Ensure you are using fresh, recommended fuel if the fuel is old or non-recommended. Recharge the battery to 12.8 VDC if the battery voltage is low. Drain the fuel system and refuel if water is present in the fuel.