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The Stihl Service Kit gives you the three worn parts that kill power and chew up engines when they get gummed or clogged: air filter, spark plug, and fuel filter. These parts stop dirt, restore throttle response, prevent fouled plugs, and keep fuel feeding clean so the engine breathes and fires like it should. Swapping them is the fastest way to fix bogging, rough idle, and hard starts without guessing at bigger repairs. The kit fits MS 271 and MS 291 (also listed for MS 311 and MS 391 in some markets) and is sold under the Service Kit 13 label — part numbers vary by region (examples: 130088 / 11400074103). Use the genuine kit to keep fitment and performance exact. Stihl designs these kits for routine maintenance. Many retailers and Stihl instructions point out that replacing the air filter, fuel filter and spark plug at service intervals increases life and reliability. Replacement is straightforward with the saw’s combo tool; some packaging shows a simple hook or guide for pulling the fuel filter out. Buy the kit, swap the three parts, and your MS 271 or MS 291 will run cleaner, start easier, and stay in the cut longer. That’s cheap insurance on a saw that makes money every time you fire it up.