{"title":"DRT Cylinder Heads","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eDRT Cylinder Heads are designed, tested, and manufactured in the USA! They are a 2 piece design that offer interchangeable combustion chamber inserts that are each optimized for different power characteristics. You can make your bike smooth and linear, or an absolute fire breathing beast! Domes A through C are designed to run safely on 91-93 octane fuel. Please refer to the product description for more details. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlease reach out to Brad with any questions or if you need help deciding which dome may be best for you! \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ebrad@berad-products.com\u003c\/span\u003e\u003c\/p\u003e","products":[{"product_id":"drt-cylinder-head-kit-yamaha-yz250x-1999","title":"DRT Cylinder Head Kit YAMAHA YZ250(X) 1999+","description":"\u003cp class=\"p1\"\u003eDRT Cylinder Head Kit YAMAHA YZ250(X) 1999+\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cmeta charset=\"utf-8\"\u003eDRT cylinder heads are the cutting edge of cylinder head design, offering optimized performance for every riding style. Proudly designed and manufactured in the United States!\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eFitment:\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eYAMAHA YZ250 1999+\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cmeta charset=\"utf-8\"\u003eYAMAHA YZ250X 2016+\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003ca href=\"https:\/\/www.youtube.com\/watch?v=mUKkQuCiHk4\" target=\"_blank\" title=\"DRT Cylinder Head Install Tutorial\" rel=\"noopener\"\u003eCLICK HERE FOR INSTALL VIDEO!\u003c\/a\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eBase Cylinder Head Kit Includes:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003eHead\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eDome\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eO-Ring Kit (3 pieces)\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eCopper Washer Kit\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eInstallation Instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cstrong\u003eBenefits compared to stock:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Optimized performance: more power where you need it, when you need it\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Choose between 3 dome insert options. Order one, two, or all 3 to unlock full control over the feel of your engine. Each dome offers very different power delivery characteristics!\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Increased detonation resistance: more efficient combustion gains performance while also increasing reliability\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Better cooling: targeted heat removal where it’s most needed, giving further reliability gains\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Cleaner, more consistent jetting\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Reduced fuel consumption\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003eDomes A through C are safe to run on 91+ octane (AKI) pump fuel. While each dome varies in\u003cspan class=\"Apple-converted-space\"\u003e  \u003c\/span\u003ecompression ratio, they each have chamber geometry optimized for specific power delivery profiles. Please refer to the descriptions below to decide what will best suit you and your riding! Domes D and E provide the most peak power and require high octane fuel to prevent detonation. See specifications and power descriptions below.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eDome A (low compression\/91+ octane):\u003c\/strong\u003e\u003c\/span\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. \u003ca href=\"https:\/\/youtu.be\/IX9omgw125M\" title=\"DRT Cylinder Head Dome A Low Compression\" rel=\"noopener\" target=\"_blank\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eCLICK HERE FOR VIDEO REVIEW\u003c\/strong\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eDome B (mid compression\u003cmeta charset=\"utf-8\"\u003e\/91+ octane):\u003c\/strong\u003e\u003c\/span\u003e Luggable low end with a quick ramp into strong top end pull. Slight torque increase with quicker revving and harder hitting power band compared to dome A. Classic “250 2 stroke” feel! For the rider that likes some spice when they get on the pipe! \u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eVIDEO REVIEW COMING SOON\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eDome C (high compression\u003cmeta charset=\"utf-8\"\u003e\/91+ octane):\u003c\/strong\u003e\u003c\/span\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! \u003ca href=\"https:\/\/youtu.be\/HJwL_yl2aPU\" title=\"DRT Cylinder Head Dome C High Compression\" rel=\"noopener\" target=\"_blank\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eCLICK HERE FOR VIDEO REVIEW\u003c\/strong\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eDome D (high compression\/100+ octane):\u003c\/strong\u003e\u003c\/span\u003e Similar power curve to Dome C but MORE power across the rev range! 100+ octane required to prevent detonation.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eDome E (high compression\/110+ octane):\u003c\/strong\u003e\u003c\/span\u003e \u003cmeta charset=\"utf-8\"\u003eSimilar power curve to Dome C\/D but EVEN MORE power across the rev range! 110+ octane required to prevent detonation.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cem\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003e\u003cspan style=\"color: rgb(249, 1, 1); text-decoration: underline;\"\u003eDRT and BeRAD Products strongly recommend hiring professional help for installation. \u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cem\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003e\u003cspan style=\"color: rgb(249, 1, 1); text-decoration: underline;\"\u003eDRT and BeRAD Products are not responsible for any injury or damages resulting from use or installation of this product.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eReturn Policy: Returns of unused and undamaged items will be accepted within 30 days of the shipping date. When items are returned and inspected, a refund will be submitted, less the cost of shipping and a 20% restocking fee.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1056\/5310\/files\/Jetting-Chart-YZ250-2000.jpg?v=1779311370\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cimg\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1056\/5310\/files\/Squish_Chart.png?v=1779311371\" alt=\"\"\u003e\u003cimg\u003e\u003c\/p\u003e","brand":"DRT","offers":[{"title":"Default Title","offer_id":41929795829863,"sku":null,"price":280.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1056\/5310\/files\/DRT-HD768-R1-BLUE-DOME.png?v=1766569092"},{"product_id":"cylinder-head-copper-washer-kit-all-bike-models","title":"Cylinder Head Copper Washer Kit (all bike models)","description":"\u003cp\u003eCylinder Head Copper Washer Kit\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eFitment:\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eYAMAHA YZ250 1999+\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eYAMAHA YZ250X 2016+\u003c\/p\u003e\n\u003cp\u003eYAMAHA YZ125 2005+\u003c\/p\u003e\n\u003cp\u003eYAMAHA YZ125X 2020+\u003c\/p\u003e","brand":"DRT","offers":[{"title":"Default Title","offer_id":42045621731431,"sku":null,"price":12.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1056\/5310\/files\/DRT-CW768_6.jpg?v=1779303516"},{"product_id":"cylinder-head-o-ring-kits-all-bike-models","title":"Cylinder Head O-Ring Kits (All bike models)","description":"\u003cp\u003eCylinder Head O-Ring Kit Includes:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDome O-Ring\u003c\/li\u003e\n\u003cli\u003eInner Cylinder O-Ring\u003c\/li\u003e\n\u003cli\u003eOuter Cylinder O-Ring\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eFitment:\u003c\/p\u003e\n\u003cp\u003eYAMAHA YZ250 1999+\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eYAMAHA YZ250X 2016+\u003c\/p\u003e\n\u003cp\u003eYAMAHA YZ125 2005+\u003c\/p\u003e\n\u003cp\u003eYAMAHA YZ125X 2020+\u003c\/p\u003e","brand":"DRT","offers":[{"title":"Default Title","offer_id":42045626122343,"sku":null,"price":15.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1056\/5310\/files\/DRT-ORing-Kit_bef559e5-4b9d-4189-a9f9-5bc038271b15.png?v=1766571058"},{"product_id":"drt-cylinder-head-dome-insert-yamaha-yz250x-1999","title":"DRT Cylinder Head Dome Insert ONLY YAMAHA YZ250(X) 1999+","description":"\u003cp\u003eDRT Cylinder Head Dome Insert Yamaha YZ250(X) 1999+\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eDRT cylinder heads are the cutting edge of cylinder head design, offering optimized performance for every riding style. Proudly designed and manufactured in the United States!\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cstrong\u003eBenefits compared to stock:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Optimized performance: more power where you need it, when you need it\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Choose between 3 dome insert options. Order one, two, or all 3 to unlock full control over the feel of your engine. Each dome offers very different power delivery characteristics!\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Increased detonation resistance: more efficient combustion gains performance while also increasing reliability\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Better cooling: targeted heat removal where it’s most needed, giving further reliability gains\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Cleaner, more consistent jetting\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Reduced fuel consumption\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003eDomes A through C are safe to run on 91+ octane (AKI) pump fuel. While each dome varies in\u003cspan class=\"Apple-converted-space\"\u003e  \u003c\/span\u003ecompression ratio, they each have chamber geometry optimized for specific power delivery profiles. Please refer to the descriptions below to decide what will best suit you and your riding!\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eDome A (low compression):\u003c\/strong\u003e\u003c\/span\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.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eDome B (mid compression):\u003c\/strong\u003e\u003c\/span\u003e Luggable low end with a quick ramp into strong top end pull. Slight torque increase with quicker revving and harder hitting power band compared to dome A. Classic “250 2 stroke” feel! For the rider that likes some spice when they get on the pipe!\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eDome C (high compression):\u003c\/strong\u003e\u003c\/span\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!\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003eFitment:\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eYAMAHA YZ250 1999+\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cmeta charset=\"utf-8\"\u003eYAMAHA YZ250X 2016+\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cem\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003e\u003cspan style=\"color: rgb(249, 1, 1); text-decoration: underline;\"\u003eDRT and BeRAD Products strongly recommend hiring professional help for installation. \u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cem\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003e\u003cspan style=\"color: rgb(249, 1, 1); text-decoration: underline;\"\u003eDRT and BeRAD Products are not responsible for any injury or damages resulting from use or installation of this product.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eReturn Policy: Returns of unused and undamaged items will be accepted within 30 days of the shipping date. When items are returned and inspected, a refund will be submitted, less the cost of shipping and a 20% restocking fee.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1056\/5310\/files\/Screenshot_2025-11-28_at_11.04.16_AM.png?v=1764345867\"\u003e\u003c\/p\u003e","brand":"DRT","offers":[{"title":"Default Title","offer_id":42045828300903,"sku":null,"price":110.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1056\/5310\/files\/DRT-HD768-R1-DOME-C.png?v=1766651606"},{"product_id":"yz250-yz250x-freight-train-performance-package-1","title":"YZ250 \/ YZ250X Freight Train Performance Package","description":"\u003cp\u003eYZ250 \/ YZ250X Freight Train Performance Package:\u003c\/p\u003e\n\u003cp\u003eBase package includes the following. Please click on each product for detailed descriptions:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.berad-products.com\/collections\/beradsbest\/products\/lectron-billetron-pro-38-125cc-300cc\" title=\"Lectron Billetron Pro Carburetor\" rel=\"noopener\" target=\"_blank\"\u003eLectron Pro 38 Carburetor\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.berad-products.com\/collections\/beradsbest\/products\/drt-cylinder-head-kit-yamaha-yz250x-1999\" title=\"DRT Cylinder Head YZ250(X) 1999+\" rel=\"noopener\" target=\"_blank\"\u003eDRT Cylinder Head Kit\u003c\/a\u003e (outer head, 1 dome, copper washer kit, 3 piece o-ring kit)\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.berad-products.com\/collections\/boyesen-factory-racing\/products\/boyesen-rad-valve-torque-variation-low-end-power\" title=\"Boyesen High Torque RAD Valve Performance Intake\" rel=\"noopener\" target=\"_blank\"\u003eBoyesen High Torque RAD Valve Performance Intake\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.berad-products.com\/collections\/funnelweb-filters\/products\/funnelweb-air-filter\" title=\"Funnelweb Air Filter\" rel=\"noopener\" target=\"_blank\"\u003eFunnelweb Air Filter\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUpgrade Options:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAnodized Lectron Pro 38\u003c\/li\u003e\n\u003cli\u003eAnodized DRT Cylinder Head\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.berad-products.com\/collections\/drt\/products\/drt-cylinder-head-dome-insert-yamaha-yz250x-1999\" title=\"DRT Cylinder Head Dome Inserts\" rel=\"noopener\" target=\"_blank\"\u003eAdditional DRT Domes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca title=\"Boyesen Supercooler High Flow Coolant Pump\" href=\"https:\/\/www.berad-products.com\/collections\/boyesen-factory-racing\/products\/boyesen-supercooler-kit\" target=\"_blank\"\u003eBoyesen Supercooler High Flow Coolant Pump\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.berad-products.com\/collections\/boyesen-factory-racing\/products\/boyesen-works-edition-factory-racing-clutch-cover\" rel=\"noopener\" target=\"_blank\"\u003eBoyesen Works Edition Factory Clutch Cover\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.berad-products.com\/collections\/boyesen-factory-racing\/products\/boyesen-works-edition-factory-racing-ignition-cover\" rel=\"noopener\" target=\"_blank\"\u003eBoyesen Works Edition Factory Ignition Cover\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.berad-products.com\/collections\/berad\/products\/yz-wr-front-brake-reservoir-cap-1\" target=\"_blank\"\u003eBeRAD Front Brake Reservoir Cover\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.berad-products.com\/collections\/drt\/products\/cylinder-head-copper-washer-kit\" target=\"_blank\"\u003eSpare copper washers (cylinder head)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.berad-products.com\/collections\/drt\/products\/cylinder-head-o-ring-kit\" target=\"_blank\"\u003eSpare o-rings (cylinder head)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWant to make your YZ250(X) an absolute weapon? It all starts at the airbox. The \u003cspan style=\"text-decoration: underline;\"\u003e\u003cem\u003e\u003cstrong\u003eFunnelweb Pro-Line Air Filter\u003c\/strong\u003e\u003c\/em\u003e\u003c\/span\u003e provides twice the surface area over standard filters. This means more air flow and protection from dust. After air passes through the filter, it's sent through the gate of power: The \u003cspan style=\"text-decoration: underline;\"\u003e\u003cem\u003e\u003cstrong\u003eLectron Pro Carb\u003c\/strong\u003e\u003c\/em\u003e\u003c\/span\u003e. This carburetor uses a steep bore taper to maximize air velocity, creating a stronger, more responsive pull from your engine. Idle to over-rev, this carb RIPS! With its special X-Rod metering technology, you don't have to worry about swapping jets...It doesn't have them! With this design, the carb also compensates for temperature and elevation extremely well so your bike stays running crisp and strong. Externally adjustable Torque Jet and Power Jet screws allow you to independently tune the bottom and top end fueling without even having to shut the bike off! When that carb opens up, the air rushes through, accelerating into the intake. The \u003cstrong\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cem\u003eBoyesen High Torque RAD Valve\u003c\/em\u003e\u003c\/span\u003e \u003c\/strong\u003egulps in air\/fuel mixture velocities of over 500mph at over 200 times per second. Its m\u003cspan\u003eulti-staged reed petal stacks feature Aerospace carbon material interwoven into tension combinations that maximize power delivery and peak horsepower. \u003c\/span\u003e\u003cspan\u003eIntegrated into the Rad Valve's seamless interior chamber are 4-way aerodynamic directional dividers that distribute the angled charge evenly without flow loss. Each channel has its own unique Power Profile, scientifically shaped to produce instant, explosive movements of air. Beyond the RAD Valve, the air\/fuel mixture enters the cylinder. This is where the \u003cspan style=\"text-decoration: underline;\"\u003e\u003cem\u003e\u003cstrong\u003eDRT Cylinder Head \u003c\/strong\u003e\u003c\/em\u003e\u003c\/span\u003ecomes in. \u003c\/span\u003e\u003cspan\u003eThe cast OEM cylinder heads large squish clearance can lead to tuning woes, detonation, poor fuel economy and throttle response, and less power. The billet aluminum DRT head is a 2 piece design that gives you multiple combustion chamber insert options that can easily be swapped to have the bike produce the power you need, when you need it. It fixes the shortcomings of the stock head, looks incredible, and gives a large boost in performance without sacrificing ride-ability.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFrom the airbox to the combustion chamber, this Freight Train Performance Package brings you everything you need to get your YZ250(X) running like an absolute weapon for motocross, enduro, and anything else you decide to throw at it. Give your bike the performance it deserves!\u003c\/span\u003e\u003c\/p\u003e","brand":"BeRAD Products","offers":[{"title":"Default Title","offer_id":42194360402023,"sku":null,"price":1250.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1056\/5310\/files\/FreightTrainYZ250.png?v=1771304262"},{"product_id":"drt-cylinder-head-kit-yamaha-yz125x-2005","title":"DRT Cylinder Head Kit YAMAHA YZ125(X) 2005+","description":"\u003cp class=\"p1\"\u003eDRT Cylinder Head Kit YAMAHA YZ125(X) 2005+\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cmeta charset=\"utf-8\"\u003eDRT cylinder heads are the cutting edge of cylinder head design, offering optimized performance for every riding style. Proudly designed and manufactured in the United States!\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eFitment:\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eYAMAHA YZ125 2005+\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cmeta charset=\"utf-8\"\u003eYAMAHA YZ125X 2020+\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca href=\"https:\/\/www.youtube.com\/watch?v=mUKkQuCiHk4\" title=\"DRT Cylinder Head Install Tutorial\" rel=\"noopener\" target=\"_blank\"\u003eCLICK HERE FOR INSTALL VIDEO!\u003c\/a\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eBase Cylinder Head Kit Includes:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003eHead\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eDome\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eO-Ring Kit (3 pieces)\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eCopper Washer Kit\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eInstallation Instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cstrong\u003eBenefits compared to stock:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Optimized performance: more power where you need it, when you need it\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Choose between 3 dome insert options. Order one, two, or all 3 to unlock full control over the feel of your engine. Each dome offers very different power delivery characteristics!\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Increased detonation resistance: more efficient combustion gains performance while also increasing reliability\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Better cooling: targeted heat removal where it’s most needed, giving further reliability gains\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Cleaner, more consistent jetting\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Reduced fuel consumption\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003eDomes A and B are safe to run on 91+ octane (AKI) pump fuel. Dome C may require 93+ octane for riders staying in higher rpm for longer periods of time. While each dome varies in\u003cspan class=\"Apple-converted-space\"\u003e  \u003c\/span\u003ecompression ratio, they each have chamber geometry optimized for specific power delivery profiles. Please refer to the descriptions below to decide what will best suit you and your riding! Domes D and E provide the most peak power and require high octane fuel to prevent detonation. See specifications and power descriptions below.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eDome A (low compression\/91+ octane):\u003c\/strong\u003e\u003c\/span\u003e Low end improvement compared to stock with a linear feeling mid range 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.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eDome B (mid compression\u003cmeta charset=\"utf-8\"\u003e\/91+ octane):\u003c\/strong\u003e\u003c\/span\u003e \u003cmeta charset=\"utf-8\"\u003eLow end improvement compared to stock with a quick ramp into strong top end pull. Slight bottom end torque increase from Dome A with a quicker revving and harder hitting power band compared to dome A. For the rider that keeps it at wide open.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eDome C (high compression\u003cmeta charset=\"utf-8\"\u003e\/91+ octane***):\u003c\/strong\u003e\u003c\/span\u003e Luggable low end with a broad mid range. Offers the most low end torque and peak power. Snappy and \"connected with throttle\" feel. Yeah, this one pulls hard! ***Higher octane fuel may required for faster riders*** \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eDome D (high compression\/100+ octane):\u003c\/strong\u003e\u003c\/span\u003e COMING SOON! Similar power curve to Dome C but MORE power across the rev range! 100+ octane required to prevent detonation.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eDome E (high compression\/110+ octane):\u003c\/strong\u003e\u003c\/span\u003e COMING SOON! \u003cmeta charset=\"utf-8\"\u003eSimilar power curve to Dome C\/D but EVEN MORE power across the rev range! 110+ octane required to prevent detonation.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cem\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003e\u003cspan style=\"color: rgb(249, 1, 1); text-decoration: underline;\"\u003eDRT and BeRAD Moto strongly recommend hiring professional help for installation. \u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cem\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003e\u003cspan style=\"color: rgb(249, 1, 1); text-decoration: underline;\"\u003eDRT and BeRAD Moto are not responsible for any injury or damages resulting from use or installation of this product.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eReturn Policy: Returns of unused and undamaged items will be accepted within 30 days of the shipping date. When items are returned and inspected, a refund will be submitted, less the cost of shipping and a 20% restocking fee.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1056\/5310\/files\/Screenshot_2026-05-10_at_5.38.05_PM.png?v=1778449099\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1056\/5310\/files\/Screenshot_2026-05-10_at_5.37.41_PM.png?v=1778449099\"\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cimg\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1056\/5310\/files\/Screenshot_2026-05-10_at_7.40.58_PM.png?v=1778456472\" alt=\"\"\u003e\u003c\/p\u003e","brand":"DRT","offers":[{"title":"Default Title","offer_id":43753518465127,"sku":null,"price":280.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1056\/5310\/files\/DRT-HD842-R1-BLUE-DOME.jpg?v=1778905733"},{"product_id":"drt-cylinder-head-dome-insert-only-yamaha-yz125x-2005","title":"DRT Cylinder Head Dome Insert ONLY - YAMAHA YZ125(X) 2005+","description":"\u003cp\u003eDRT Cylinder Head Dome Insert Yamaha YZ125(X) 2005+\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eDRT cylinder heads are the cutting edge of cylinder head design, offering optimized performance for every riding style. Proudly designed and manufactured in the United States!\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cstrong\u003eBenefits compared to stock:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Optimized performance: more power where you need it, when you need it\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Choose between 3 dome insert options. Order one, two, or all 3 to unlock full control over the feel of your engine. Each dome offers very different power delivery characteristics!\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Increased detonation resistance: more efficient combustion gains performance while also increasing reliability\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Better cooling: targeted heat removal where it’s most needed, giving further reliability gains\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Cleaner, more consistent jetting\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e-Reduced fuel consumption\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003eDomes A and B are safe to run on 91+ octane (AKI) pump fuel. Dome C may require 93+ octane for riders staying in higher rpm for longer periods of time. While each dome varies in\u003cspan class=\"Apple-converted-space\"\u003e \u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003ecompression ratio, they each have chamber geometry optimized for specific power delivery profiles. Please refer to the descriptions below to decide what will best suit you and your riding! Domes D and E provide the most peak power and require high octane fuel to prevent detonation. See specifications and power descriptions below.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan\u003e\u003cstrong\u003eDome A (low compression\/91+ octane):\u003c\/strong\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eLow end improvement compared to stock with a linear feeling mid range 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.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan\u003e\u003cstrong\u003eDome B (mid compression\/91+ octane):\u003c\/strong\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eLow end improvement compared to stock with a quick ramp into strong top end pull. Slight bottom end torque increase from Dome A with a quicker revving and harder hitting power band compared to dome A. For the rider that keeps it at wide open.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan\u003e\u003cstrong\u003eDome C (high compression\/91+ octane***):\u003c\/strong\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eLuggable low end with a broad mid range. Offers the most low end torque and peak power. Snappy and \"connected with throttle\" feel. Yeah, this one pulls hard! ***Higher octane fuel may required for faster riders*** \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan\u003e\u003cstrong\u003eDome D (high compression\/100+ octane):\u003c\/strong\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eCOMING SOON! Similar power curve to Dome C but MORE power across the rev range! 100+ octane required to prevent detonation.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan\u003e\u003cstrong\u003eDome E (high compression\/110+ octane):\u003c\/strong\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eCOMING SOON!\u003cspan\u003e \u003c\/span\u003eSimilar power curve to Dome C\/D but EVEN MORE power across the rev range! 110+ octane required to prevent detonation.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cem\u003e\u003cstrong\u003eDRT and BeRAD Moto strongly recommend hiring professional help for installation.\u003c\/strong\u003e\u003c\/em\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cem\u003e\u003cstrong\u003eDRT and BeRAD Moto are not responsible for any injury or damages resulting from use or installation of this product.\u003c\/strong\u003e\u003c\/em\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eReturn Policy: Returns of unused and undamaged items will be accepted within 30 days of the shipping date. When items are returned and inspected, a refund will be submitted, less the cost of shipping and a 20% restocking fee.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1056\/5310\/files\/Screenshot_2026-05-10_at_5.38.05_PM.png?v=1778449099\" alt=\"\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1056\/5310\/files\/Screenshot_2026-05-10_at_5.37.41_PM.png?v=1778449099\" alt=\"\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1056\/5310\/files\/Screenshot_2026-05-10_at_7.40.58_PM.png?v=1778456472\" alt=\"\"\u003e\u003c\/p\u003e","brand":"DRT","offers":[{"title":"Default Title","offer_id":43770098548839,"sku":null,"price":110.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1056\/5310\/files\/DRT-DM842-R1A.jpg?v=1778905733"},{"product_id":"yz125-yz125x-freight-train-performance-package-1","title":"YZ125 \/ YZ125X Freight Train Performance Package","description":"\u003cp\u003eYZ125 \/ YZ125X Freight Train Performance Package:\u003c\/p\u003e\n\u003cp\u003eFits: 2005+ YZ125, 2020+ YZ125X\u003c\/p\u003e\n\u003cp\u003eBase package includes the following. Please click on each product for detailed descriptions:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.berad-products.com\/collections\/beradsbest\/products\/lectron-billetron-pro-38-125cc-300cc\" title=\"Lectron Billetron Pro Carburetor\" rel=\"noopener\" target=\"_blank\"\u003eLectron Pro 38 Carburetor\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.berad-products.com\/collections\/beradsbest\/products\/drt-cylinder-head-kit-yamaha-yz250x-1999\" title=\"DRT Cylinder Head YZ250(X) 1999+\" rel=\"noopener\" target=\"_blank\"\u003eDRT Cylinder Head Kit\u003c\/a\u003e (outer head, 1 dome, copper washer kit, 3 piece o-ring kit)\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.berad-products.com\/collections\/boyesen-factory-racing\/products\/boyesen-rad-valve-torque-variation-low-end-power\" title=\"Boyesen High Torque RAD Valve Performance Intake\" rel=\"noopener\" target=\"_blank\"\u003eBoyesen High Torque RAD Valve Performance Intake\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.berad-products.com\/collections\/funnelweb-filters\/products\/funnelweb-air-filter\" title=\"Funnelweb Air Filter\" rel=\"noopener\" target=\"_blank\"\u003eFunnelweb Air Filter\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUpgrade Options:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAnodized Lectron Pro 38\u003c\/li\u003e\n\u003cli\u003eAnodized DRT Cylinder Head\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.berad-products.com\/collections\/drt\/products\/drt-cylinder-head-dome-insert-yamaha-yz250x-1999\" title=\"DRT Cylinder Head Dome Inserts\" rel=\"noopener\" target=\"_blank\"\u003eAdditional DRT Domes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca title=\"Boyesen Supercooler High Flow Coolant Pump\" href=\"https:\/\/www.berad-products.com\/collections\/boyesen-factory-racing\/products\/boyesen-supercooler-kit\" target=\"_blank\"\u003eBoyesen Supercooler High Flow Coolant Pump\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.berad-products.com\/collections\/boyesen-factory-racing\/products\/boyesen-works-edition-factory-racing-clutch-cover\" rel=\"noopener\" target=\"_blank\"\u003eBoyesen Works Edition Factory Clutch Cover\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.berad-products.com\/collections\/boyesen-factory-racing\/products\/boyesen-works-edition-factory-racing-ignition-cover\" rel=\"noopener\" target=\"_blank\"\u003eBoyesen Works Edition Factory Ignition Cover\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.berad-products.com\/collections\/berad\/products\/yz-wr-front-brake-reservoir-cap-1\" target=\"_blank\"\u003eBeRAD Front Brake Reservoir Cover\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.berad-products.com\/collections\/drt\/products\/cylinder-head-copper-washer-kit\" target=\"_blank\"\u003eSpare copper washers (cylinder head)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.berad-products.com\/collections\/drt\/products\/cylinder-head-o-ring-kit\" target=\"_blank\"\u003eSpare o-rings (cylinder head)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWant to make your YZ250(X) an absolute weapon? It all starts at the airbox. The \u003cspan style=\"text-decoration: underline;\"\u003e\u003cem\u003e\u003cstrong\u003eFunnelweb Pro-Line Air Filter\u003c\/strong\u003e\u003c\/em\u003e\u003c\/span\u003e provides twice the surface area over standard filters. This means more air flow and protection from dust. After air passes through the filter, it's sent through the gate of power: The \u003cspan style=\"text-decoration: underline;\"\u003e\u003cem\u003e\u003cstrong\u003eLectron Pro Carb\u003c\/strong\u003e\u003c\/em\u003e\u003c\/span\u003e. This carburetor uses a steep bore taper to maximize air velocity, creating a stronger, more responsive pull from your engine. Idle to over-rev, this carb RIPS! With its special X-Rod metering technology, you don't have to worry about swapping jets...It doesn't have them! With this design, the carb also compensates for temperature and elevation extremely well so your bike stays running crisp and strong. Externally adjustable Torque Jet and Power Jet screws allow you to independently tune the bottom and top end fueling without even having to shut the bike off! When that carb opens up, the air rushes through, accelerating into the intake. The \u003cstrong\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cem\u003eBoyesen High Torque RAD Valve\u003c\/em\u003e\u003c\/span\u003e \u003c\/strong\u003egulps in air\/fuel mixture velocities of over 500mph at over 200 times per second. Its m\u003cspan\u003eulti-staged reed petal stacks feature Aerospace carbon material interwoven into tension combinations that maximize power delivery and peak horsepower. \u003c\/span\u003e\u003cspan\u003eIntegrated into the Rad Valve's seamless interior chamber are 4-way aerodynamic directional dividers that distribute the angled charge evenly without flow loss. Each channel has its own unique Power Profile, scientifically shaped to produce instant, explosive movements of air. Beyond the RAD Valve, the air\/fuel mixture enters the cylinder. This is where the \u003cspan style=\"text-decoration: underline;\"\u003e\u003cem\u003e\u003cstrong\u003eDRT Cylinder Head \u003c\/strong\u003e\u003c\/em\u003e\u003c\/span\u003ecomes in. \u003c\/span\u003e\u003cspan\u003eThe cast OEM cylinder heads large squish clearance can lead to tuning woes, detonation, poor fuel economy and throttle response, and less power. The billet aluminum DRT head is a 2 piece design that gives you multiple combustion chamber insert options that can easily be swapped to have the bike produce the power you need, when you need it. It fixes the shortcomings of the stock head, looks incredible, and gives a large boost in performance without sacrificing ride-ability.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFrom the airbox to the combustion chamber, this Freight Train Performance Package brings you everything you need to get your YZ250(X) running like an absolute weapon for motocross, enduro, and anything else you decide to throw at it. Give your bike the performance it deserves!\u003c\/span\u003e\u003c\/p\u003e","brand":"BeRAD Products","offers":[{"title":"Default Title","offer_id":43858440814695,"sku":null,"price":1220.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1056\/5310\/files\/Freight_Train_YZ125.jpg?v=1780939809"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1056\/5310\/collections\/DRT-HD768-R1-BLUE-DOME.png?v=1769720830","url":"https:\/\/berad-products.myshopify.com\/collections\/drt\/performance.oembed","provider":"BeRAD Moto","version":"1.0","type":"link"}