{"product_id":"brc-yamaha-500cc-conversion-kit-1999-2025-bolt-in-500cc-conversion-brc-yzm500-99-21","title":"BRC YAMAHA 500cc CONVERSION KIT 1999-2025, BOLT IN 500CC CONVERSION","description":"\u003cp\u003eYamaha 500cc conversion kit for 1999-2025 applications, developed as a bolt-in 500cc counterbalanced 2-stroke conversion based on the YZ250 platform. This conversion kit requires components from a donor Yamaha YZ250 engine from 1999-2025 and is designed to deliver strong motocross-focused performance with smooth, linear power delivery. It accepts donor YZ250 and YZ250X transmission components, remains kick-start compatible with a decompression button fitted to aid starting, and includes a dedicated exhaust pipe and silencer. It fits 2005-2051 aluminium frames without fabrication, while 1999-2004 steel frames require minor modification. The stock carburettor is stated to be the best fit for this package.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\t\u003cli\u003e\n\t\u003cp\u003eBolt-in 500cc counterbalanced 2-stroke conversion\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003eRequires components from a donor Yamaha YZ250 engine\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003eMotocross-focused power delivery\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003ePneumatic power valve system for linear, smooth power delivery\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003eTriple blade power valve for improved bottom-end performance\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003eAccepts donor Yamaha YZ250 and YZ250X transmission\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003eKick-start compatible\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003eDecompression button fitted to make kick-starting easier\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003eSupplied with a purpose-built pipe and silencer to fit the bike\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003eIntegral counterbalance shaft to reduce vibration\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003eDesigned to use the stock carburettor\u003c\/p\u003e\n\t\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\t\u003cli\u003e\n\t\u003cp\u003e499cc engine capacity\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003e60+ hp\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003e50+ ft-lb torque\u003c\/p\u003e\n\t\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eVehicle Fitments\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\t\u003cli\u003e\n\t\u003cp\u003e2005-2025 Yamaha aluminium frame models\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003e1999-2004 Yamaha steel frame models with minor modification\u003c\/p\u003e\n\t\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ORO2U","offers":[{"title":"Default Title","offer_id":53141542371594,"sku":"BRC-YZM500_99-21","price":7994.15,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0898\/2757\/4026\/files\/brcyzm500.jpg?v=1780393473","url":"https:\/\/2bros-mx.com\/products\/brc-yamaha-500cc-conversion-kit-1999-2025-bolt-in-500cc-conversion-brc-yzm500-99-21","provider":"2bros-mx.com","version":"1.0","type":"link"}