{"product_id":"yz250-2t-300cc-big-bore-cylinder-kit-o-72-mm-293-cc-and-exhaust-valve-kit-new-version","title":"YZ300 Athena Big Bore Cylinder Kit Ø 72 mm 1999-2027 NEW VERSION","description":"\u003ch1\u003eAthena YZ300 Kit for YZ250 Two Stroke\u003c\/h1\u003e\n\u003ch2\u003eAll new 72mm big bore kit 1999-2027 models.\u003c\/h2\u003e\n\u003cp\u003eThe Yamaha YZ250 has long been recognized as one of the most competitive and versatile two-stroke moAtocross bikes. For riders looking to unlock additional performance and tailor engine character to specific track conditions, Athena has developed the new Big Bore 300cc Cylinder Kit, engineered to increase displacement, improve power output, and deliver a more responsive riding experience.\u003c\/p\u003e\n\u003ch2\u003eEngineered for Higher Performance\u003c\/h2\u003e\n\u003cp\u003eThis latest-generation Big Bore Cylinder Kit represents a major evolution over the previous version. Every component has been redesigned and optimized to improve power, reliability, and overall rideability, making it suitable for both competitive racing and serious off-road use.\u003c\/p\u003e\n\u003ch2\u003eRedesigned Cylinder for Maximum Output\u003c\/h2\u003e\n\u003cp\u003eThe aluminum cylinder features a completely revised port layout developed to optimize gas flow and combustion efficiency. The updated internal geometry delivers stronger mid-range and top-end performance while maintaining excellent low-rpm response.\u003c\/p\u003e\n\u003ch2\u003eHigh-Efficiency Cylinder Head Design\u003c\/h2\u003e\n\u003cp\u003eThe newly developed cylinder head has been engineered to optimize compression ratio and combustion chamber efficiency. The result is improved throttle response, enhanced combustion quality, and more precise power delivery throughout the rpm range.\u003c\/p\u003e\n\u003ch2\u003eAdjustable Squish and Power Delivery Configurations\u003c\/h2\u003e\n\u003cp\u003eEngine behavior can be customized by adjusting squish clearance and the resulting cylinder height. To provide multiple setup options, the kit includes different cylinder base gaskets that allow riders to fine-tune engine characteristics according to riding style and track conditions.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHARD Configuration\u003c\/strong\u003e\u003cbr\u003eAn extremely aggressive and explosive power delivery designed for sand tracks, supercross, and situations requiring maximum acceleration.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMEDIUM Configuration\u003c\/strong\u003e\u003cbr\u003eA more progressive low-rpm power delivery with virtually no reduction in peak power, providing an excellent balance between performance and rideability.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSOFT Configuration\u003c\/strong\u003e\u003cbr\u003eA smoother and more controllable power delivery at low and mid rpm, improving traction and rider confidence on technical terrain.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eHigh-Performance Cast Piston\u003c\/h2\u003e\n\u003cp\u003eThe newly developed cast piston reduces reciprocating mass and improves engine responsiveness. Lower inertia contributes to quicker acceleration and enhanced overall engine efficiency.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eOptimized Exhaust Valve System\u003c\/h2\u003e\n\u003cp\u003eThe redesigned exhaust valve components work in conjunction with the new cylinder port timing to improve high-rpm breathing while maintaining strong low-end torque and rideability.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eComplete Kit for Professional-Level Performance\u003c\/h2\u003e\n\u003cp\u003eLike all Athena cylinder kits, this package includes premium-quality gaskets and components designed to ensure durability, reliability, and consistent performance under the most demanding racing conditions.\u003c\/p\u003e\n\u003cp\u003eAthena PN\u003cbr\u003e\u003cspan\u003eP400485100104\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Hp Race Development","offers":[{"title":"Default Title","offer_id":49029487460522,"sku":"P400485100104","price":1399.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0685\/4226\/7562\/files\/big-bore-cylinder-kit-72-mm-293-cc-and-exhaust-valve-kit-new-version_c07d7719-ac93-43b3-a8c5-a809bbf88a34_812-812.avif?v=1786372503","url":"https:\/\/v2n80g-j1.myshopify.com\/products\/yz250-2t-300cc-big-bore-cylinder-kit-o-72-mm-293-cc-and-exhaust-valve-kit-new-version","provider":"Hp Race Development","version":"1.0","type":"link"}