{"product_id":"ignition-coil-291337001","title":"291337001 Ignition Coil with Spark Plug - Fits Ryobi RY254BC, RY251PH, RY252CS, RY253SS","description":"\u003ch2\u003e291337001 Ignition Coil \u0026amp; Spark Plug Kit \u003c\/h2\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Energy Spark Output:\u003c\/strong\u003e Precision-wound internal coils generate a consistent, high-voltage pulse to ensure reliable ignition even in cold starts or high-load brush cutting conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Ignition Mapping:\u003c\/strong\u003e Specifically calibrated for Ryobi 25.4cc 2-cycle engines to provide efficient combustion, leading to smoother idling and improved throttle response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeather-Shielded Encapsulation:\u003c\/strong\u003e The internal circuitry is fully potted in high-grade, heat-resistant epoxy to protect against vibration, moisture, and debris common in outdoor landscaping.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReinforced High-Tension Lead:\u003c\/strong\u003e Equipped with a durable silicone spark plug boot and a heavy-duty wire designed to resist electrical \"arching\" and thermal degradation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Ignition Refresh:\u003c\/strong\u003e This kit includes both the electronic ignition module and a matched spark plug, providing a total solution for restoring a weak or non-existent spark.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eReplaces \/ Cross-Reference Part Numbers\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cmeta charset=\"utf-8\"\u003e291337001\u003c\/li\u003e\n\u003cli\u003e291337008\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatibility \u0026amp; Fitment\u003c\/h3\u003e\n\u003cp\u003eThis ignition module is a standard replacement for the Ryobi and Homelite 25cc to 26cc \"Full Crank\" and \"Half Crank\" engine platforms. Key compatible models include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRyobi String Trimmers:\u003c\/strong\u003e RY252CS, RY253SS, RY251PH, RY254BC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRyobi Brush Cutters:\u003c\/strong\u003e Various models utilizing the 25cc 2-cycle engine chassis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHomelite Trimmers:\u003c\/strong\u003e Fits several 25cc\/26cc handheld models that utilize the 291337001 part number.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNote:\u003c\/strong\u003e Always verify your original coil's mounting hole spacing and wire orientation, as some newer 25cc models may utilize a different module configuration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo Spark Condition:\u003c\/strong\u003e The most common failure; the trimmer will not start despite having fresh fuel and a clean carburetor because the plug is not firing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Failure (Hot Stalling):\u003c\/strong\u003e The engine runs perfectly for 10–15 minutes but dies suddenly as it gets hot and refuses to restart until the coil cools down.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Misfiring:\u003c\/strong\u003e Rhythmic stuttering or \"popping\" at full throttle, indicating the coil is struggling to maintain a steady electrical pulse under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHard Starting:\u003c\/strong\u003e A weak spark requires excessive pulls on the starter cord to get the engine to fire, often leading to a flooded engine.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisible Insulation Damage:\u003c\/strong\u003e The spark plug wire is frayed or showing signs of being chewed by rodents, which can cause the spark to jump to the engine block instead of the plug.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Air Gap Rule:\u003c\/strong\u003e For the strongest spark, the air gap between the coil legs and the flywheel magnets should be approximately 0.010\" to 0.012\". Use a standard business card as a feeler gauge during installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck the Ground Path:\u003c\/strong\u003e Ensure the mounting surfaces on the engine block and the coil legs are clean and free of rust or oil. The coil grounds through its mounting bolts; a weak ground will cause a weak spark.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKill Switch Wiring:\u003c\/strong\u003e Be careful when reconnecting the small spade terminal for the stop wire. If this wire is pinched or grounds against the engine housing, the engine will never start.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlywheel Magnet Cleanup:\u003c\/strong\u003e While the cover is off, use a rag to wipe away any metal shavings or debris from the flywheel magnets to ensure the strongest possible magnetic induction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGap the Spark Plug:\u003c\/strong\u003e Before installation, verify the spark plug gap (typically 0.025\") to ensure optimal combustion and to prevent unnecessary stress on the new ignition module.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BlueStarsParts","offers":[{"title":"Default Title","offer_id":45371211645117,"sku":"AZ00271753","price":15.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2576\/7548\/files\/AZ00271753_1_4822aa09-62e4-4ff3-918c-305001bd4d3e.jpg?v=1762246278","url":"https:\/\/bluestarspartstrend.com\/products\/ignition-coil-291337001","provider":"BlueStars Parts","version":"1.0","type":"link"}