{"product_id":"yamaha-yz400f-wr400f-carburetor-starter-plunger-5be-14171-00","title":"Yamaha YZ400F \/ WR400F Carburetor Starter Plunger 5BE-14171-00","description":"\u003cp\u003e\u003cimg\u003e\u003cimg\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0899\/5009\/3636\/files\/download.png?v=1736759431\" alt=\"Genuine Yamaha OEM\" style=\"float: none;\"\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"3\"\u003e\u003cb data-path-to-node=\"3\" data-index-in-node=\"0\"\u003eProduct Description\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"3\"\u003eThis genuine Yamaha factory-original starter plunger (commonly referred to as the choke knob or cold-start valve assembly) is an essential component for Keihin FCR carburetors on early-generation high-performance four-stroke dirt bikes. When pulled, this spring-loaded plunger opens a dedicated fuel bypass circuit inside the carburetor to enrich the air-fuel mixture for smooth, immediate starting when the engine is cold. Precision-machined to ensure a perfect airtight seal when pushed back in, preventing rich-running issues and erratic idling.\u003c\/p\u003e\n\u003cp data-path-to-node=\"4\"\u003e\u003cb data-path-to-node=\"4\" data-index-in-node=\"0\"\u003eVehicle Compatibility\u003c\/b\u003e\u003c\/p\u003e\n\u003ctable data-path-to-node=\"5\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMake\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eModel Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"5,1,0,0\"\u003e\u003cb data-path-to-node=\"5,1,0,0\" data-index-in-node=\"0\"\u003eYamaha\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"5,1,1,0\"\u003eYZ400F (1998–1999)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"5,1,2,0\"\u003e\u003cspan class=\"citation-486 citation-end-486\"\u003eCarburetor Starter \/ Choke Plunger\u003csup class=\"superscript\" data-turn-source-index=\"3\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"5,2,0,0\"\u003e\u003cb data-path-to-node=\"5,2,0,0\" data-index-in-node=\"0\"\u003eYamaha\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"5,2,1,0\"\u003eWR400F (1998–1999)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"5,2,2,0\"\u003e\u003cspan class=\"citation-485 citation-end-485\"\u003eCarburetor Starter \/ Choke Plunger\u003csup class=\"superscript\" data-turn-source-index=\"4\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp data-path-to-node=\"6\"\u003e\u003ci data-path-to-node=\"6\" data-index-in-node=\"0\"\u003eNote: This plunger configuration is highly specific to the original 39mm Keihin FCR carburetors equipped on the groundbreaking 1998–1999 400cc four-stroke platforms.\u003c\/i\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"7\"\u003e\u003cb data-path-to-node=\"7\" data-index-in-node=\"0\"\u003eFitment Details\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"7\"\u003eThis is a brand-new, direct replacement. To install, unthread the plastic retaining nut on the side of the carburetor body and slide the old assembly out. Ensure the internal starter passage is thoroughly cleaned of any gum, varnish, or grit before sliding the new plunger, needle, and spring in. Be very careful when threading the plastic starter nut back into the carburetor body; hand-thread it first to prevent cross-threading, then snug it gently as over-tightening can easily crack the plastic guide hex.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePlease ensure the part number matches your motorbike before purchasing. If you have any questions about the part or its compatibility, feel free to contact us. We’re here to help!\u003c\/p\u003e\n\u003cp\u003eAt\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eDmmotorcycles\u003c\/strong\u003e, we’ve specialized in vintage and vintage sports motorcycles and parts directly from Japan since 1998. We stock a wide selection of rare\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003egenuine\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand high-quality\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eaftermarket\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eparts and continually update our inventory to meet growing demand.\u003c\/p\u003e\n\u003cp\u003eLooking for a specific part? Don’t hesitate to ask! We may have it in stock even if it’s not listed online. If not, we’ll do our best to source it for you.\u003c\/p\u003e\n\u003cp\u003eWe’re also happy to provide guidance on installation and offer excellent after-sales support to ensure your satisfaction.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eShipping Information\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eWe ship worldwide, carefully inspecting and securely packing all parts to ensure safe delivery. Your order will be insured and shipped quickly, with the best available shipping option chosen for speed and reliability.\u003c\/p\u003e\n\u003cp\u003ePlease note:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAll parts are shipped from Cyprus (Europe).\u003c\/li\u003e\n\u003cli\u003eCustomers outside the EU may incur additional import taxes based on the value of the item.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"font-size: large; font-family: Arial;\"\u003e\u003cimg alt=\"\"\u003e\u003c\/p\u003e","brand":"Yamaha","offers":[{"title":"Default Title","offer_id":56834637005124,"sku":null,"price":49.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0899\/5009\/3636\/files\/MVIMG_20260603_093930.jpg?v=1781082983","url":"https:\/\/www.dm-motorcycles.com\/products\/yamaha-yz400f-wr400f-carburetor-starter-plunger-5be-14171-00","provider":"www.dm-motorcycles.com","version":"1.0","type":"link"}