{"product_id":"valve-stem-seal-by-yamaha-2mb-e2129-00-00","title":"Valve Stem Seal by Yamaha","description":"\u003cdiv style=\"font-family: Arial; font-size: 12pt;\"\u003e\n\u003ch2\u003eYamaha UTV\/ATV \u0026amp; Side by Side Valves \u0026amp; Springs - Available at buywitchdoctors.com\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Specifications: Genuine OEM Yamaha Valve Stem Seal, Part # 2MB-E2129-00-00.\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eKeep your machine running like new with genuine Yamaha Valves \u0026amp; Springs paired with premium maintenance parts from buywitchdoctors.com. Valves open and close to let the air and fuel mixture into the cylinder and let exhaust gases out, while the valve springs snap each valve shut and keep it following the cam at every RPM. Because they open and close thousands of times a minute under extreme heat, their condition directly affects compression, power, idle quality, and engine life. Riders most often replace valves and springs after a loss of compression or power, a rough or uneven idle, backfiring or popping, ticking or tapping from the top end, burnt, bent, or pitted valves, weak, broken, or sagging springs, worn valve seats or guides, or damage from over-revving, overheating, or a dropped valve.\u003c\/p\u003e\n\u003ch3\u003eWhy Choose Genuine OEM Yamaha Parts?\u003c\/h3\u003e\n\u003cp\u003eChoosing original equipment manufacturer (OEM) parts ensures your vehicle maintains its factory-standard performance, reliability, and fuel efficiency. Genuine parts eliminate the guesswork of aftermarket alternatives, offering a seamless integration with your engine's configuration.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExact-Fit Design:\u003c\/strong\u003e Matched to Yamaha's original bolt patterns, sealing surfaces, and dimensions for a leak-resistant fit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory-Spec Quality:\u003c\/strong\u003e Built to the same standards as the parts installed on your machine at the factory.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeace of Mind:\u003c\/strong\u003e Skip the trial and error of universal or aftermarket parts that may not seal or align correctly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003ePremium Materials \u0026amp; Precision Engineering\u003c\/h3\u003e\n\u003cp\u003eCrafted to strict factory tolerances, these components utilize high-grade alloys and chemical-resistant seals. This specialized engineering withstands harsh off-road vibrations, extreme temperatures, and modern fuel additives, preventing premature wear and leaks. Genuine valves are forged from heat-resistant steel with precisely ground faces and hardened stems, and the springs are made from fatigue-resistant wire wound to exact tension, so the valves seat tightly, resist burning and stretching, and keep following the cam through high RPM and constant heat cycles.\u003c\/p\u003e\n\u003ch3\u003eComprehensive Model Fitment (2015-Current)\u003c\/h3\u003e\n\u003cp\u003eThis genuine OEM part is engineered for a wide range of Yamaha side-by-side (SxS) and all-terrain vehicles (ATV) built from 2015 to the current model year. Please verify your series matches below:\u003c\/p\u003e\n\u003ch3\u003eUtility Task Vehicles (UTVs \/ Side-by-Sides)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"https:\/\/buywitchdoctors.com\/collections\/yamaha-viking-parts\" target=\"_blank\" title=\"Direct Link to all Viking Series OEM \u0026amp; Aftermarket Parts and Accessories Available at Buywitchdoctors.com\" rel=\"noopener\"\u003eViking Series\u003c\/a\u003e:\u003c\/strong\u003e Viking 700 EPS, Viking 700 Ranch Edition, Viking VI EPS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"https:\/\/buywitchdoctors.com\/collections\/yamaha-wolverine-parts\" target=\"_blank\" title=\"Direct Link to all Wolverine Series OEM \u0026amp; Aftermarket Parts and Accessories Available at Buywitchdoctors.com\" rel=\"noopener\"\u003eWolverine Series\u003c\/a\u003e:\u003c\/strong\u003e Wolverine R-Spec, Wolverine X2 850, Wolverine X4 850, Wolverine X2 1000, Wolverine RMAX2 1000 (Sport, XT-R, Limited), Wolverine RMAX4 1000\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"https:\/\/buywitchdoctors.com\/collections\/yamaha-yxz-parts\" target=\"_blank\" title=\"Direct Link to all YXZ Series OEM \u0026amp; Aftermarket Parts and Accessories Available at Buywitchdoctors.com\" rel=\"noopener\"\u003eYXZ Series\u003c\/a\u003e:\u003c\/strong\u003e YXZ1000R, YXZ1000R SS\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAll-Terrain Vehicles (ATVs)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"https:\/\/buywitchdoctors.com\/collections\/yamaha-yfz-parts-and-accessories\" target=\"_blank\" title=\"Direct Link to all YFZ Series OEM \u0026amp; Aftermarket Parts and Accessories Available at Buywitchdoctors.com\" rel=\"noopener\"\u003eYFZ Series\u003c\/a\u003e: \u003c\/strong\u003eYFZ50\u003cstrong\u003e, \u003c\/strong\u003eYFZ450R, YFZ450R SE\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"https:\/\/buywitchdoctors.com\/collections\/yamaha-raptor-parts-and-accessories\" target=\"_blank\" title=\"Direct Link to all Raptor Series OEM \u0026amp; Aftermarket Parts and Accessories Available at Buywitchdoctors.com\" rel=\"noopener\"\u003eRaptor Series\u003c\/a\u003e:\u003c\/strong\u003e Raptor 90, Raptor 110, Raptor 700, Raptor 700R, Raptor 700R SE\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"https:\/\/buywitchdoctors.com\/collections\/yamaha-grizzly-parts-and-accessories\" target=\"_blank\" title=\"Direct Link to all Grizzly Series OEM \u0026amp; Aftermarket Parts and Accessories Available at Buywitchdoctors.com\" rel=\"noopener\"\u003eGrizzly Series\u003c\/a\u003e:\u003c\/strong\u003e Grizzly 90, Grizzly 110, Grizzly 700 EPS, Grizzly 700 SE, Grizzly 700 XT-R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"https:\/\/buywitchdoctors.com\/collections\/yamaha-kodiak-parts-and-accessories\" target=\"_blank\" title=\"Direct Link to all Kodiak Series OEM \u0026amp; Aftermarket Parts and Accessories Available at Buywitchdoctors.com\" rel=\"noopener\"\u003eKodiak Series\u003c\/a\u003e:\u003c\/strong\u003e Kodiak 450, Kodiak 450 EPS, Kodiak 700, Kodiak 700 EPS, Kodiak 700 SE\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e⚠️ \u003cstrong\u003eIMPORTANT DISCLAIMER:\u003c\/strong\u003e Fitment can vary by production date and sub-model trim. Always verify your exact original equipment part number from your vehicle's schematic or consult a certified technician before finalizing your purchase to guarantee flawless compatibility.\u003c\/p\u003e\n\u003ch3\u003eOther Popular Parts \u0026amp; Secondary Accessories\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"https:\/\/buywitchdoctors.com\/collections\/utv-engine-rebuild-kits-atv?product_type\/Rocker-Arms-Tappets\/vendor\/Yamaha\" target=\"_blank\" title=\"Direct Link to all Yamaha OEM Rocker Arms \u0026amp; Tappets sold at buywitchdoctors.com\" rel=\"noopener\"\u003eRocker Arms \u0026amp; Tappets\u003c\/a\u003e:\u003c\/strong\u003e Rocker arms and tappets transfer motion from the camshaft to the valves. Inspect them for wear, pitting, and play whenever the valves are serviced so the new parts are not driven by a worn valvetrain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"https:\/\/buywitchdoctors.com\/collections\/utv-engine-rebuild-kits-atv?product_type\/Cams-Components\/vendor\/Yamaha\" target=\"_blank\" title=\"Direct Link to all Yamaha OEM Cams \u0026amp; Components sold at buywitchdoctors.com\" rel=\"noopener\"\u003eCams \u0026amp; Components\u003c\/a\u003e:\u003c\/strong\u003e The camshaft and its related parts time the opening and closing of each valve. Check the lobes, bearings, and cam chain components while the top end is apart so valve timing stays accurate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"https:\/\/buywitchdoctors.com\/collections\/utv-engine-gaskets-seals-atv?product_type\/Top-End-Gaskets\/Shop-By\/Aftermarket\" target=\"_blank\" title=\"Direct Link to All Aftermarket Top End Gaskets Sold At Buywitchdoctors.com\" rel=\"noopener\"\u003eTop End Gaskets\u003c\/a\u003e:\u003c\/strong\u003e Top end gaskets seal the head, cylinder, and related surfaces and are typically replaced whenever the top end is opened. Pair a fresh set with your valve service for a leak-free reassembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"https:\/\/buywitchdoctors.com\/collections\/utv-engine-rebuild-kits-atv?product_type\/Pistons-Components\/vendor\/Yamaha\" target=\"_blank\" title=\"Direct Link to all Yamaha OEM Pistons \u0026amp; Components sold at buywitchdoctors.com\" rel=\"noopener\"\u003ePistons \u0026amp; Components\u003c\/a\u003e:\u003c\/strong\u003e The piston, rings, and pin share the combustion chamber with the valves. If a valve failed or was bent, inspect the piston crown for contact marks or damage at the same time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"https:\/\/buywitchdoctors.com\/collections\/utv-engine-rebuild-kits-atv?product_type\/Engine-Cylinder\/vendor\/Yamaha\" target=\"_blank\" title=\"Direct Link to all Yamaha OEM Engine Cylinder sold at buywitchdoctors.com\" rel=\"noopener\"\u003eEngine Cylinders\u003c\/a\u003e:\u003c\/strong\u003e The cylinder guides the piston and contains combustion pressure. Check the bore for scoring or wear during valve service so compression is restored fully.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"https:\/\/buywitchdoctors.com\/collections\/utv-engine-rebuild-kits-atv?product_type\/Connecting-Rods-Components\/vendor\/Yamaha\" target=\"_blank\" title=\"Direct Link to all Yamaha OEM Connecting Rods \u0026amp; Components sold at buywitchdoctors.com\" rel=\"noopener\"\u003eConnecting Rods \u0026amp; Components\u003c\/a\u003e:\u003c\/strong\u003e The connecting rods link the pistons to the crank. If a dropped valve or hydrolock was involved, inspect the rods and bearings for bends or damage before reassembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"https:\/\/buywitchdoctors.com\/collections\/utv-engine-gaskets-seals-atv?product_type\/Engine-Gaskets-Oil-Seals\/vendor\/Yamaha\" target=\"_blank\" title=\"Direct Link to all Yamaha OEM Engine Gaskets \u0026amp; Oil Seals sold at buywitchdoctors.com\" rel=\"noopener\"\u003eEngine Gaskets \u0026amp; Oil Seals\u003c\/a\u003e:\u003c\/strong\u003e Engine gaskets and oil seals keep oil, coolant, and pressure where they belong. Replace them whenever the engine is opened so your repair starts clean and leak-free.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQs)\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I know when my Yamaha valves and springs need to be replaced, and how do I confirm the right ones for my machine?\u003c\/strong\u003e\u003cbr\u003eA: Watch for low compression, loss of power, a rough idle, backfiring or popping, ticking from the top end, and burnt, bent, pitted, or leaking valves and weak, broken, or shortened springs found during inspection. Before replacing parts, check the valve clearances, cam timing, and the condition of the seats and guides, since a valve that will not seal may be a seat or adjustment problem. Because valves and springs vary by model, model year, engine, and intake versus exhaust position, confirm the correct parts and inspection procedure using your Yamaha service manual or factory schematic, or contact us with your model and VIN and we will help you match them.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do mud, water, sand, and heat affect valves and springs on the trail?\u003c\/strong\u003e\u003cbr\u003eA: Valves and springs live inside the engine, so harsh conditions affect them indirectly. Dust or sand that gets past the air filter can wear the seats and guides, water ingestion can bend valves, and heat or low oil can burn valves and fatigue springs. Keep your air filter and intake sealed, change oil on schedule, and after deep water crossings check for milky oil or new noises. Follow your Yamaha service manual for correct service intervals, valve adjustment, and water-crossing guidance.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"margin-top: auto; margin-bottom: auto; line-height: normal;\"\u003e\u003cb\u003e\u003cspan style=\"color: #ff2a00;\"\u003ePRO TIP: \u003c\/span\u003e\u003c\/b\u003e\u003ca href=\"https:\/\/buywitchdoctors.com\/blogs\/news\/yamaha-oem-vs-aftermarket-parts-comparison\" title=\"Direct link to Buywitchdoctors.com blog about Yamaha OEM vs. Aftermarket Parts: Are Factory Components Best for Your Trail Riding?\" rel=\"noopener\" target=\"_blank\"\u003e\u003cb\u003e\u003cspan\u003e\u003cspan style=\"color: blue;\"\u003eLearn More about Yamaha OEM vs. Aftermarket Parts\u003c\/span\u003e\u003c\/span\u003e\u003c\/b\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"margin-top: auto; margin-bottom: auto; line-height: normal;\"\u003e \u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal; tab-stops: center 3.25in;\"\u003e\u003cb\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman'; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; color: #ff2a00;\"\u003ePRO TIP:\u003c\/span\u003e\u003c\/b\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman'; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;\"\u003e \u003cb\u003eLearn more about \u003ca href=\"https:\/\/buywitchdoctors.com\/blogs\/news\/atv-or-utv-ticking-noise-how-to-spot-a-bad-camshaft-valves\" title=\"Direct link to buywitchdoctors.com blog about ATV or UTV Ticking Noise? How to Spot a Bad Camshaft \u0026amp; Valves\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan style=\"color: blue;\"\u003eHow to Spot a Bad Camshaft \u0026amp; Valves.\u003c\/span\u003e\u003c\/a\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal;\"\u003e\u003cb\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman'; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; color: #ff2a00;\"\u003ePRO TIP:\u003c\/span\u003e\u003c\/b\u003e\u003cb\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman'; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;\"\u003e \u003c\/span\u003e\u003c\/b\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman'; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;\"\u003e\u003ca href=\"https:\/\/buywitchdoctors.com\/blogs\/news\/how-to-replace-atv-utv-engine-valve-cover-gasket\" title=\"Direct link to Buywitchdoctors.com blog about How to Replace an ATV\/UTV Engine Valve Cover Gasket\" target=\"_blank\" rel=\"noopener\"\u003e\u003cb\u003e\u003cspan style=\"color: blue;\"\u003eHow to Replace an ATV\/UTV Engine Valve Cover Gasket\u003c\/span\u003e\u003c\/b\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; line-height: normal;\"\u003e\u003cb\u003e\u003cspan style=\"mso-bidi-font-family: Calibri; color: #ff2a00;\"\u003ePRO TIP: \u003ca href=\"https:\/\/buywitchdoctors.com\/blogs\/news\/a-buyer-s-guide-to-utv-atv-engine-components\" title=\"Direct link to Buywitchdoctors.com blog about A Buyer’s Guide To UTV\/ATV Internal Engine Components\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan style=\"color: blue;\"\u003eA Buyer’s Guide To UTV\/ATV Internal Engine Components\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cbr\u003e\u003cstrong\u003eUpgrade Your Ride's Engine Top End \u0026amp; Valvetrain Performance Today\u003c\/strong\u003e\u003cbr\u003eFactory-fit valves and springs restore compression, smooth idle, and strong power on every ride. Complete your top end service with matching rocker arms \u0026amp; tappets, cams \u0026amp; components, top end gaskets, pistons \u0026amp; components, engine cylinders, connecting rods \u0026amp; components, and engine gaskets \u0026amp; oil seals so your whole engine works together and stays sealed, balanced, and trail-ready. Order your genuine Yamaha replacement components today from \u003ca href=\"https:\/\/buywitchdoctors.com\/collections\/find-all-yamaha-off-road-utv-atv-parts?Shop-By\/OEM\" title=\"Direct Link to the Collection of All Yamaha OEM ATV \u0026amp; UTV Parts \u0026amp; Accessories Available at BuyWitchdoctors.com.\" rel=\"noopener\" target=\"_blank\"\u003ebuywitchdoctors.com\u003c\/a\u003e and experience top-tier off-road performance!\u003cbr\u003e\u003cbr\u003e\n\u003cp\u003eAre You Looking to Find Great Places \u0026amp; Adventurous Trails to Ride Your UTV, Side by Side or ATV? Check out these highly recommended places:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/northernoutdoors.com\" title=\"Direct Link to Northern Outdoors ATV\/UTV Park\" rel=\"noopener\" target=\"_blank\"\u003eNorthern Outdoors\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.blm.gov\/visit\/imperial-sand-dunes\" title=\"Direct Link to Imperial Sand Dunes ATV\/UTV Park\" rel=\"noopener\" target=\"_blank\"\u003eImperial Sand Dunes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/blm.gov\/visit\/johnson-valley-ohv-area\" title=\"Direct Link to Johnson Valley ATV\/UTV Park\" rel=\"noopener\" target=\"_blank\"\u003eJohnson Valley OHV Area\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/mycountyparks.com\" title=\"Direct Link to Gypsum City ATV\/UTV Park\" rel=\"noopener\" target=\"_blank\"\u003eGypsum City OHV Park\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/leatherwoodoffroad.com\" title=\"Direct Link to Leatherwood ATV\/UTV Park\" rel=\"noopener\" target=\"_blank\"\u003eLeatherwood Off-Road Park\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Off Road Express","offers":[{"title":"Default Title","offer_id":41657004294206,"sku":"2MB-E2129-00-00","price":5.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0069\/2502\/5349\/files\/Yamaha_OEM-Part-Number_2MB-E2129-00-00_fd90118f-f7b1-4894-93cf-91f2d9f703ff.png?v=1772561865","url":"https:\/\/buywitchdoctors.com\/products\/valve-stem-seal-by-yamaha-2mb-e2129-00-00","provider":"Witchdoctors","version":"1.0","type":"link"}