{"title":"Yamaha YZ250 Carburetor \u0026 Parts","description":"\u003cp dir=\"ltr\"\u003eThe YZ250 has outlasted nearly every two-stroke on the market, and the reason is the powerband — a strong mid-range that pulls hard through the top. The stock 38mm Keihin PWK doesn't always let you use it.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThe complaint is consistent across YZ250 owners: the bike is jetted for one set of conditions and rides well in exactly those conditions. Take it up 3,000 feet, or ride it in November instead of July, or switch to oxygenated race fuel, and the mid-range goes soft or the bike starts loading up on the pipe. The fix is a jet change. Then another one when the conditions shift back.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eA Lectron carburetor removes that cycle. Instead of fixed jets calibrated for a single air density, a tapered metering rod sits directly in the airflow path and meters fuel against what the engine is actually pulling. When air density drops, fuel delivery drops with it. The mixture holds without a jet change, at any elevation, in any temperature, on pump gas or race fuel.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWhat YZ250 riders report after the swap:\u003c\/strong\u003e cleaner throttle response off the bottom, stronger and more connected mid-range where the bike lives, and no more chasing jets between tracks.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eEverything on this page fits a YZ250.\u003c\/strong\u003e Carburetor kits, intake manifolds, air boots, metering rods, and tuning tools — filtered to the YZ250 so you're not cross-referencing part numbers to find out what bolts up.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eFitment.\u003c\/strong\u003e The 38mm PRO-SERIES and H-Series EVO fit the YZ250 from 1999 to present with no modification — the stock intake boot and airbox stay. Earlier YZ250s from 1974 to 1998 fit as well, though some years need a period-correct intake manifold. We manufacture those in-house, and the ones that fit your year are listed here alongside the carburetors.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWhich carburetor.\u003c\/strong\u003e The PRO-SERIES adds an adjustable Power Jet for top-end fueling and a Torque Jet for the low-to-mid range, giving you fine control if you switch fuels or run a modified top end. The H-Series EVO delivers the same airflow-referenced metering in a simpler package for riders who set it once and ride.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eAlready running a Lectron?\u003c\/strong\u003e The metering rods, Easy Tuning Kit, and adjustment tool on this page cover routine tuning and service.\u003c\/p\u003e","products":[{"product_id":"2t-motorcycle-carbs-proseries","title":"PRO-SERIES Carburetor for 2-Stroke | Max Performance \u0026 Precision (38mm-40mm)","description":"\u003cp\u003e\u003cstrong\u003eUnleash Maximum Performance for Your 2-Stroke Engine\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe Lectron PRO-SERIES carburetor is the ultimate high-performance carburetor for 125cc-500cc 2-stroke engines. Engineered for instant throttle response, increased horsepower, and unmatched rideability with effortless external adjustments that take out the hassle. This carburetor is built for racers, trail riders, weekend warriors, and serious performance enthusiasts. \u003c\/p\u003e\n\u003ch3 class=\"\" data-end=\"1666\" data-start=\"1644\"\u003e🏁 Who It's For:\u003c\/h3\u003e\n\u003cp class=\"\" data-end=\"1825\" data-start=\"1667\"\u003eRiders who want race-grade power, quick throttle response, and full adjustability in a premium package. Ideal for 125cc–500cc 2-stroke applications. Common on Yamaha YZ 125 \u0026amp; YZ 250, KTM 150SX \u0026amp; KTM 300XC, Honda CR 125 \u0026amp; CR 250, Suzuki RM 125 \u0026amp; RM 250, 125cc 2-Strokes, 250cc 2-strokes and many many more!\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Lectron Fuel Systems","offers":[{"title":"PRO-SERIES Carburetor for 2-Stroke","offer_id":50626927362340,"sku":"1138-PRO","price":749.0,"currency_code":"USD","in_stock":true},{"title":"PRO-SERIES Carburetor for 2-Stroke | 38mm","offer_id":50626934014244,"sku":"1138-PRO-38","price":749.0,"currency_code":"USD","in_stock":true},{"title":"PRO-SERIES Carburetor for 2-Stroke | 38mm Anodized","offer_id":50626937192740,"sku":"1138-PRO-38-A","price":848.0,"currency_code":"USD","in_stock":true},{"title":"PRO-SERIES Carburetor for 2-Stroke | 38mm Anodized TPS","offer_id":50626946597156,"sku":"1138-PRO-38-A-TPS","price":898.0,"currency_code":"USD","in_stock":true},{"title":"PRO-SERIES Carburetor for 2-Stroke | 40mm","offer_id":50626949218596,"sku":"1138-PRO-40","price":749.0,"currency_code":"USD","in_stock":true},{"title":"PRO-SERIES Carburetor for 2-Stroke | 40mm Anodized","offer_id":50626951119140,"sku":"1138-PRO-40-A","price":848.0,"currency_code":"USD","in_stock":true},{"title":"PRO-SERIES Carburetor for 2-Stroke | 40mm Anodized TPS","offer_id":50626953183524,"sku":"1138-PRO-40-A-TPS","price":898.0,"currency_code":"USD","in_stock":true},{"title":"PRO-SERIES Carburetor for 2-Stroke | 38mm TPS","offer_id":50626957902116,"sku":"1138-PRO-38-TPS","price":799.0,"currency_code":"USD","in_stock":true},{"title":"PRO-SERIES Carburetor for 2-Stroke | 40mm TPS","offer_id":50626959048996,"sku":"1138-PRO-40-TPS","price":799.0,"currency_code":"USD","in_stock":true},{"title":"PRO-SERIES Carburetor for 2-Stroke #MWS Options 9","offer_id":50630187483428,"sku":"1138-PRO-38-A","price":848.0,"currency_code":"USD","in_stock":true},{"title":"PRO-SERIES Carburetor for 2-Stroke #MWS Options 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Precision-machined from 6061 billet aluminum, the EVO delivers stronger construction, tighter tolerances, and modern upgrades that riders can feel on every ride. With a refined high-velocity bore and our Xcelerator metering rod, the EVO provides snappier throttle response, improved torque, and eliminates lean bogs under rapid throttle openings — all while retaining the Lectron legendary \u003ci\u003eset-it-and-forget-it\u003c\/i\u003e simplicity.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%;\"\u003eUpgrades like the SafeDrain overflow bowl, hard-anodized billet slide, and compact 78mm body make the EVO more durable, easier to install, and better performing than the cast H-Series it replaces. Add in anodized color options and optional quick-turn thumb screws, and you’ve got a carburetor that balances performance, durability, and customization in one package.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv class=\"MsoNormal\" align=\"center\" style=\"text-align: center;\"\u003e\u003chr size=\"2\" width=\"100%\" align=\"center\"\u003e\u003c\/div\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Segoe UI Emoji',sans-serif; mso-bidi-font-family: 'Segoe UI Emoji';\"\u003e🏁\u003c\/span\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%;\"\u003e \u003cb\u003eWho It’s For:\u003c\/b\u003e\u003cbr\u003eRiders who want a \u003cb\u003esimple, billet-built upgrade\u003c\/b\u003e that delivers stronger throttle response, modern durability, and easier installation without the complexity. Perfect for 125–300cc 2-stroke riders who just want to ride more and wrench less.\u003c\/span\u003e\u003c\/p\u003e","brand":"Lectron Fuel Systems","offers":[{"title":"H-Series EVO Carburetor for 2-Stroke | 125cc-200cc Bikes","offer_id":51412385169700,"sku":"1438-HV-125","price":649.99,"currency_code":"USD","in_stock":true},{"title":"H-Series EVO Carburetor for 2-Stroke | 250cc-400cc Bikes","offer_id":51412385202468,"sku":"1438-HV-250","price":649.99,"currency_code":"USD","in_stock":true},{"title":"H-Series EVO Carburetor for 2-Stroke | 250cc-400cc Bikes #MWS Options 1","offer_id":51413923004708,"sku":"1438-HV-250-SB-A","price":748.99,"currency_code":"USD","in_stock":true},{"title":"H-Series EVO Carburetor for 2-Stroke | 125cc-200cc Bikes #MWS Options 1","offer_id":51414729883940,"sku":"1438-HV-125-SB-A","price":748.99,"currency_code":"USD","in_stock":true},{"title":"H-Series EVO Carburetor for 2-Stroke | 125cc-200cc Bikes #MWS Options 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This all-in-one kit gives you everything you need to customize how your throttle responds, with compatibility across dirt bikes, street bikes, and ATVs looking to upgrade to a precision twist throttle.\u003c\/p\u003e\n\u003ch3 data-end=\"573\" data-start=\"553\"\u003eWhat's Included:\u003c\/h3\u003e\n\u003cul data-end=\"1120\" data-start=\"574\"\u003e\n\u003cli data-end=\"668\" data-start=\"574\"\u003e\n\u003cp data-end=\"668\" data-start=\"576\"\u003e\u003cstrong data-end=\"603\" data-start=\"576\"\u003eG2 Billet Throttle Tube\u003c\/strong\u003e – CNC-machined for ultra-smooth pull and long-term durability.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"759\" data-start=\"669\"\u003e\n\u003cp data-end=\"759\" data-start=\"671\"\u003e\u003cstrong data-end=\"691\" data-start=\"671\"\u003eThrottle Housing\u003c\/strong\u003e – Rugged and lightweight, built to withstand off-road punishment.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"961\" data-start=\"760\"\u003e\n\u003cp data-end=\"961\" data-start=\"762\"\u003e\u003cstrong data-end=\"785\" data-start=\"762\"\u003e(3) G2 Control Cams\u003c\/strong\u003e – Dial in your throttle response with interchangeable cam profiles. 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Designed for riders who demand more control, power, and reliability, these heads allow you to fine-tune your power delivery with interchangeable dome options to perfectly match your riding style and terrain.\u003c\/p\u003e\n\u003ch3 data-end=\"439\" data-start=\"412\"\u003eWhy Upgrade from Stock?\u003c\/h3\u003e\n\u003cp data-end=\"633\" data-start=\"441\"\u003e\u003cstrong data-end=\"469\" data-start=\"441\"\u003eOptimized Power Delivery\u003c\/strong\u003e\u003cbr data-end=\"472\" data-start=\"469\"\u003eExperience stronger, more usable power exactly where you want it — whether you prefer smooth low-end torque, aggressive midrange punch, or extended top-end pull.\u003c\/p\u003e\n\u003cp data-end=\"880\" data-start=\"635\"\u003e\u003cstrong data-end=\"667\" data-start=\"635\"\u003eInterchangeable Dome Inserts\u003c\/strong\u003e\u003cbr data-end=\"670\" data-start=\"667\"\u003eChoose from three dome options to customize the feel of your engine. Order one, two, or all three to gain complete control over how your bike responds. Each dome delivers a distinctly different power character.\u003c\/p\u003e\n\u003cp data-end=\"1037\" data-start=\"882\"\u003e\u003cstrong data-end=\"917\" data-start=\"882\"\u003eIncreased Detonation Resistance\u003c\/strong\u003e\u003cbr data-end=\"920\" data-start=\"917\"\u003eImproved combustion efficiency enhances performance while adding an extra layer of engine protection and reliability.\u003c\/p\u003e\n\u003cp data-end=\"1199\" data-start=\"1039\"\u003e\u003cstrong data-end=\"1070\" data-start=\"1039\"\u003eEnhanced Cooling Efficiency\u003c\/strong\u003e\u003cbr data-end=\"1073\" data-start=\"1070\"\u003eStrategic heat management removes heat where it matters most, helping maintain consistent performance in demanding conditions.\u003c\/p\u003e\n\u003cp data-end=\"1339\" data-start=\"1201\"\u003e\u003cstrong data-end=\"1237\" data-start=\"1201\"\u003eCleaner, More Consistent Jetting\u003c\/strong\u003e\u003cbr data-end=\"1240\" data-start=\"1237\"\u003eImproved combustion characteristics lead to smoother throttle response and more predictable tuning.\u003c\/p\u003e\n\u003cp data-end=\"1430\" data-start=\"1341\"\u003e\u003cstrong data-end=\"1369\" data-start=\"1341\"\u003eImproved Fuel Efficiency\u003c\/strong\u003e\u003cbr data-end=\"1372\" data-start=\"1369\"\u003eGet more out of every tank with optimized burn efficiency.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eDome Options: \u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003e\u003cstrong\u003eDome A (low compression):\u003c\/strong\u003e\u003c\/span\u003e\u003cspan\u003e Mellow but very luggable low end with a linear feeling transition into a free-revving top end. The most friendly to ride but not lacking in torque or response. Great for beginner riders but plenty of fun for experienced riders too! Offers great control of traction in slick conditions.\u003cbr\u003e\u003cbr\u003e\u003cmeta charset=\"UTF-8\"\u003e \u003cstrong\u003eDome C (high compression):\u003c\/strong\u003e Hard hitting and luggable low end with a broad mid range. Offers the most low end torque and peak power. Snappy and \"connected with throttle\" feeling power . Yeah, this one pulls hard!\u003cbr\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Lectron Fuel Systems","offers":[{"title":"Raw Aluminum \/ Hi Compressoin","offer_id":52010940432676,"sku":"4530-DRT-CH","price":280.0,"currency_code":"USD","in_stock":true},{"title":"Raw Aluminum \/ Low Compression","offer_id":52010940498212,"sku":"4530-DRT-CH","price":280.0,"currency_code":"USD","in_stock":true},{"title":"Raw Aluminum \/ Bundle (Hi \u0026 Low)","offer_id":52017964056868,"sku":"4530-DRT-CH","price":390.0,"currency_code":"USD","in_stock":true},{"title":"Blue \/ Hi Compressoin","offer_id":52010940563748,"sku":"4530-DRT-CH-A","price":330.0,"currency_code":"USD","in_stock":true},{"title":"Blue \/ Low Compression","offer_id":52010940629284,"sku":"4530-DRT-CH-A","price":330.0,"currency_code":"USD","in_stock":true},{"title":"Blue \/ Bundle (Hi \u0026 Low)","offer_id":52017964089636,"sku":"4530-DRT-CH-A","price":440.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0926\/8805\/6612\/files\/DRT-HD768-R1-BLUE-DOME.png?v=1770911537"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0926\/8805\/6612\/collections\/YZ250_Collections_Image.png?v=1789069460","url":"https:\/\/lectronfuelsystems.com\/collections\/yz250-carburetors-parts.oembed","provider":"Lectron Fuel Systems","version":"1.0","type":"link"}