{"product_id":"yz250f-overbore-kit","title":"BNR Yamaha YZ250F 280cc Big Bore Kit","description":"\u003ch1\u003eYZ250F 280cc Big Bore Kit  2019-2026 \u003c\/h1\u003e\n\u003cp\u003eTurn your \u003cstrong\u003e2019-2026 Yamaha YZ250F\u003c\/strong\u003e into a \u003cstrong\u003e280cc\u003c\/strong\u003e with the BNR Motorsports Big Bore Kit.\u003c\/p\u003e\n\u003cp\u003eThis is a \u003cstrong\u003ebolt-in cylinder and piston package\u003c\/strong\u003e developed for racers and performance riders looking for increased displacement, power, and torque from their YZ250F.\u003c\/p\u003e\n\u003cp\u003eAt the heart of the kit is our \u003cstrong\u003ecustom BNR-spec JE forged piston\u003c\/strong\u003e, designed specifically for our 280cc combination. This is \u003cstrong\u003enot an off-the-shelf JE piston\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003eKit Includes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e280cc big bore cylinder\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCustom BNR-spec JE forged piston\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePiston rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePiston clips\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eTop-end gaskets\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eYour choice of standard or DLC-coated wrist pin\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCustom BNR \/ JE Piston Specs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e3.189\" (81mm) bore\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e2.110\" stock stroke\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e13.8:1 compression ratio\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eJE 977M forging\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCustom BNR piston design\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDesigned specifically for our YZ250F 280cc combination\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWrist Pin Options\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eStandard Wrist Pin\u003c\/strong\u003e\u003cbr\u003eOur standard wrist pin option for this kit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDLC-Coated Wrist Pin\u003c\/strong\u003e\u003cbr\u003ePremium DLC-coated wrist pin featuring a low-friction, wear-resistant surface for demanding race applications.\u003c\/p\u003e\n\u003ch2\u003eBolt-In 280cc Conversion\u003c\/h2\u003e\n\u003cp\u003eThis kit is designed as a \u003cstrong\u003ebolt-in 280cc conversion\u003c\/strong\u003e for the 2019-2026 YZ250F.\u003c\/p\u003e\n\u003cp\u003eNo stroker crank is required. The increased displacement is achieved through the larger bore while retaining the stock 2.110\" stroke.\u003c\/p\u003e\n\u003ch2\u003eVortex ECU Required\u003c\/h2\u003e\n\u003cp\u003eA \u003cstrong\u003eVortex ECU is required\u003c\/strong\u003e to properly run this 280cc combination.\u003c\/p\u003e\n\u003cp\u003eSend your Vortex ECU to \u003cstrong\u003eBNR Motorsports\u003c\/strong\u003e, and we can flash it with our calibration specifically developed for the \u003cstrong\u003eYZ250F 280cc big bore setup\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVortex ECU Flashing: $199.99\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhen sending your ECU to us, please download, complete, and include the BNR Motorsports ECU Form with your ECU:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003ca href=\"https:\/\/www.bnrmotorsports.com\/downloads\/BNRECUFormpdf.pdf\"\u003eDownload BNR Motorsports ECU Form\u003c\/a\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlease Note:\u003c\/strong\u003e ECU flashing is \u003cstrong\u003enot included\u003c\/strong\u003e with the 280cc big bore kit and must be purchased separately.\u003c\/p\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eYamaha YZ250F\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e2019\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e2020\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e2021\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e2022\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e2023\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e2024\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e2025\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e2026\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFits 2019-2026 YZ250F models only.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis is a performance-oriented engine package. Proper fuel, ECU calibration, and engine setup are important when running this \u003cstrong\u003e13.8:1 compression 280cc combination\u003c\/strong\u003e.\u003c\/p\u003e","brand":"BNR Motorsports","offers":[{"title":"Standard Piston Pin","offer_id":49129365176510,"sku":null,"price":1129.99,"currency_code":"USD","in_stock":true},{"title":"DLC-Coated Piston Pin","offer_id":49129365209278,"sku":null,"price":1199.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0025\/8890\/1446\/files\/BC723FE7-563B-446B-8FB1-B0641B6CFE1B.jpg?v=1790187002","url":"https:\/\/bnr-motorsports.myshopify.com\/products\/yz250f-overbore-kit","provider":"BNR Motorsports","version":"1.0","type":"link"}