{"product_id":"573935702-ignition-coil","title":"573935702 Ignition Coil with Wire - For Husqvarna 435 435E 440 440E 445 445E 450 450E Jonsered Chainsaw","description":"\u003ch2\u003e573935702 Ignition Coil\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 spark to ensure reliable ignition even in cold weather or high-altitude conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Ignition Timing:\u003c\/strong\u003e Factory-set electronic timing provides efficient combustion across the entire RPM range, improving throttle response and fuel economy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeather-Sealed Encapsulation:\u003c\/strong\u003e The internal electronics are fully potted in high-grade epoxy to protect against moisture, vibration, and the high heat typical of heavy-duty chainsaw operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Spark Plug Boot:\u003c\/strong\u003e Equipped with a heavy-duty silicone boot and a high-tension lead designed to resist cracking and \"arching\" (leaking electricity to the engine block).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Bolt-On Installation:\u003c\/strong\u003e Engineered to the exact mounting specifications of the original Husqvarna module, ensuring the correct \"air gap\" between the coil and the flywheel.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eReplaces \/ Cross-Reference Part Numbers\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e573 93 57-01\u003c\/li\u003e\n\u003cli\u003e573 93 57-02\u003c\/li\u003e\n\u003cli\u003e544 04 70-01\u003c\/li\u003e\n\u003cli\u003e582 86 89-01\u003c\/li\u003e\n\u003cli\u003e522 96 71-01\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatibility \u0026amp; Fitment\u003c\/h3\u003e\n\u003cp\u003eThis ignition coil fits the second-generation \"X-Torq\" engines used in Husqvarna and Jonsered mid-range chainsaws. Key compatible models include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHusqvarna:\u003c\/strong\u003e 435, 435E, 440, 440E, 445, 445E, 450, 450E (and II models).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJonsered:\u003c\/strong\u003e CS2240, CS2240S, CS2245, CS2245S, CS2250, CS2250S.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMcCulloch:\u003c\/strong\u003e CS410, CS450.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNote:\u003c\/strong\u003e Always check your original coil's part number; early 435\/440 models may use a different module with a different plug wire angle.\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:\u003c\/strong\u003e The most obvious sign; after checking that the spark plug and kill switch are functional, the engine still lacks ignition.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Cuts Out When Hot:\u003c\/strong\u003e The saw starts and runs fine for 10–15 minutes, but dies as the engine heats up and won't restart until it cools down (a classic sign of internal coil failure).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Misfires:\u003c\/strong\u003e Rhythmic \"popping\" or stuttering at high RPMs, indicating the coil is failing to provide a consistent spark under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHard Starting:\u003c\/strong\u003e A weak spark requires excessive pulling and perfect fuel conditions just to get the engine to fire.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisible Damage:\u003c\/strong\u003e The spark plug wire is frayed, or the epoxy housing on the coil has cracked or melted.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation \u0026amp; Timing Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Business Card Trick:\u003c\/strong\u003e For the engine to run correctly, the \"Air Gap\" between the coil legs and the flywheel magnets must be precise. A standard business card (~0.010\" to 0.012\") is the perfect gauge. Place the card between the coil and flywheel, let the magnets pull the coil tight against it, then tighten the mounting bolts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck the Ground:\u003c\/strong\u003e Ensure the metal mounting \"legs\" of the coil and the engine block are clean and free of rust or oil. The coil grounds through the mounting bolts; a poor ground will cause weak or no spark.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKill Switch Wire:\u003c\/strong\u003e Be careful when reconnecting the small spade terminal for the kill switch. If this wire is pinched or grounded against the engine block, the saw will never start.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInspect the Flywheel:\u003c\/strong\u003e While the cover is off, check the magnets on the flywheel for metal shavings or debris. Use a rag to clean them to ensure the strongest possible magnetic pulse.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpark Plug Health:\u003c\/strong\u003e Always install a fresh \u003cstrong\u003eNGK BPMR7A\u003c\/strong\u003e (or equivalent) spark plug when replacing the coil. A fouled or improperly gapped plug can put undue stress on a new ignition module.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BlueStarsParts","offers":[{"title":"Default Title","offer_id":45369698451645,"sku":"AZ00200904","price":20.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2576\/7548\/files\/AZ00110266_1_78e63ae6-b0ff-49f3-affa-b1adc0af35d0.jpg?v=1762246428","url":"https:\/\/bluestarspartstrend.com\/products\/573935702-ignition-coil","provider":"BlueStars Parts","version":"1.0","type":"link"}