{"title":"Cylinder Heads","description":null,"products":[{"product_id":"1993-2002-kx250-two-piece-billet-cylinder-head","title":"1993-2002 KX250 Two-Piece Billet Cylinder Head","description":"\u003cp\u003eOur two-piece billet cylinder head was designed with aluminum frame conversions in mind! The original 1993-2002 KX250 engine has its cylinder head mount location forward facing, making it difficult to mount into later model aluminum frames when doing a frame conversion build. This cylinder head bolts directly onto one of these engines and relocates the head stay location to the back, like the 03+ KX250 engine.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eNew O-rings and dowel pins included\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eUse this cylinder head in conjunction with any of our KX250 conversion kits if you are installing a 1993-2002 KX250 engine\u003c\/em\u003e\u003c\/p\u003e","brand":"🏁Two-Strokes Only🏁","offers":[{"title":"20.24cc [95 Octane] \/ RAW","offer_id":48285268738327,"sku":"","price":335.0,"currency_code":"USD","in_stock":false},{"title":"20.24cc [95 Octane] \/ BLACK ANODIZED","offer_id":49358324334871,"sku":"","price":335.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0687\/3818\/7543\/files\/IMG-3272.heic?v=1712021081"},{"product_id":"1986-2001-honda-cr500-billet-cylinder-head-kit","title":"1986-2001  Honda CR500 Billet Cylinder Head Kit","description":"\u003cp\u003eIntroducing the ultimate precision-machined cylinder head from Two-Strokes Only, featuring an interchangeable combustion chamber specifically engineered for optimal power for your riding conditions. This head boasts a raw, exposed finish that highlights the precision of its machining, coupled with significantly improved water ducting to keep your engine running cooler and harder, from the gate drop to the checkered flag.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003ePrecision Engineering \u0026amp; Contents\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eManufactured from a high-quality alloy for maximum durability and heat transfer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSecure Sealing:\u003c\/b\u003e Utilizes O-rings for a perfect seal (O-rings included).\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eEasy Starts:\u003c\/b\u003e A KPMI decompression valve is included, making starting challenging engines like the CR500R exceptionally easy. Simply push the button and fire it up—the valve closes automatically once the engine is running.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cem\u003eIn the Box: Decompression valve, 7 copper washers, and 7 nutcaps are all included, O-rings.\u003c\/em\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eThe Enemy of Power: Heat\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003eHeat is the ultimate enemy of any engine, especially high-performance two-strokes. As the race progresses and engine temperatures climb, power naturally drops off. If you’ve noticed your engine losing its edge late in a moto, or you struggle to clear the same jumps you made early on, you’re experiencing heat soak.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eOur Solution: Superior Cooling\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003eFor years, Two-Strokes Only has been at the forefront of two-stroke performance. Our engineers recognized that traditional stock heads, made via casting, resulted in small, rough, and inefficient water jackets that severely restrict optimal coolant flow.\u003c\/p\u003e\n\u003cp\u003eOur innovation was to precision-machine the cylinder head in two separate pieces and optimize the flow of all of our heads using modern design and simulation tools such as CFD. This design achieves vastly superior flow dynamics and cooling efficiency, ensuring that the power you start with is the power you finish with. \u003cstrong\u003e\u003cem\u003eExperience consistent, race-winning performance.\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e","brand":"🏁Two-Strokes Only🏁","offers":[{"title":"STOCK (66.4CC)","offer_id":51579124711703,"sku":null,"price":625.0,"currency_code":"USD","in_stock":true},{"title":"100+ OCTANE (62.4CC)","offer_id":51579124744471,"sku":null,"price":625.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0687\/3818\/7543\/files\/FullSizeRender_600ac506-9243-4479-bd26-02e4eb5b265f.heic?v=1777684672"},{"product_id":"1986-2001-honda-cr500-billet-cylinder-head-kit-copy","title":"1988-2004  Kawasaki KX500 Billet Cylinder Head Kit","description":"\u003cp\u003eIntroducing the ultimate precision-machined KX500 cylinder head from Two-Strokes Only, featuring an interchangeable combustion chamber specifically engineered for optimal power for your riding conditions. This head boasts a raw, exposed finish that highlights the precision of its machining, coupled with significantly improved water ducting to keep your engine running cooler and harder, from the gate drop to the checkered flag.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003ePrecision Engineering \u0026amp; Contents\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eManufactured from a high-quality alloy for maximum durability and heat transfer.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eSecure Sealing:\u003c\/b\u003e Utilizes O-rings for a perfect seal (O-rings included).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eEasy Starts:\u003c\/b\u003e A KPMI decompression valve is included, making starting challenging engines like the KX500 exceptionally easy. Simply push the button and fire it up—the valve closes automatically once the engine is running.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003eIn the Box: Decompression valve, 7 copper washers, and 7 nutcaps are all included, O-rings.\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eThe Enemy of Power: Heat\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003eHeat is the ultimate enemy of any engine, especially high-performance two-strokes. As the race progresses and engine temperatures climb, power naturally drops off. If you’ve noticed your engine losing its edge late in a moto, or you struggle to clear the same jumps you made early on, you’re experiencing heat soak.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eOur Solution: Superior Cooling\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003eFor years, Two-Strokes Only has been at the forefront of two-stroke performance. 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Manufactured from high-grade cast aluminum with optimized squish band geometry and coolant flow channels to resist detonation, reduce operating temperatures, and withstand the extreme pressures of aggressive racing environments.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSpecs \u0026amp; Details\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eManufacturer Part Number:\u003c\/b\u003e 422-2001HD\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAlternative Part Number:\u003c\/b\u003e Cylinder Works CH2001-K01\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eComponent Type:\u003c\/b\u003e Replacement Cylinder Head Assembly\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMaterial \u0026amp; Construction:\u003c\/b\u003e High-grade cast aluminum engineered to strict OEM thermal and structural tolerances\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCompatibility:\u003c\/b\u003e Direct bolt-on replacement for stock cylinder configurations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTSO Garage Note\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eA reliable, cost-effective replacement cylinder head for legendary YZ250 powerplants. 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