{"title":"ProX Pistons - Yamaha","description":"\u003cp\u003eProX Yamaha Piston Kits deliver \u003cstrong\u003eOEM-quality performance, durability, and precision\u003c\/strong\u003e at a fraction of the cost. Manufactured by the \u003cstrong\u003esame trusted suppliers as Yamaha’s OEM pistons\u003c\/strong\u003e, these kits are engineered for \u003cstrong\u003eperfect fit, superior heat dissipation, and long-lasting reliability\u003c\/strong\u003e. Whether you're \u003cstrong\u003erebuilding your engine for peak performance or routine maintenance\u003c\/strong\u003e, ProX pistons provide the \u003cstrong\u003ebest balance of power and affordability\u003c\/strong\u003e to keep your Yamaha running strong.\u003c\/p\u003e","products":[{"product_id":"pro-x-piston-kit-piston-ring-c-clips-and-wrist-pin-yamaha-yz65","title":"Pro-X Piston Forged Kit - 2018-2019 Yamaha YZ450F, YZ450FX, and WR450F","description":"\u003cp\u003eThe PRO-X Piston Forged Kit is designed for unbeatable performance and longevity in the 2018-2019 Yamaha YZ450F, YZ450FX, and WR450F. It features precision-machined CNC parts, made from high-quality, low-expansion, low-friction piston alloy. With plated cylinders offered in standard and A, B,. sizes, allowing for increased re-boring possibilities and extended cylinder lifespan.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures of the Pro-X Yamaha YZ65 piston:\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe smart solution; save money on engine repairs\u003c\/li\u003e\n\u003cli\u003eManufactured in Japan and designed as OEM replacements\u003c\/li\u003e\n\u003cli\u003eForged to meets or exceeds OEM specifications, then CNC machined to extremely close tolerances\u003c\/li\u003e\n\u003cli\u003eAvailable in standard sizes along with fractional increases in Standard (A) (B)\u003c\/li\u003e\n\u003cli\u003eAdditional oversize available in .010 increments\u003c\/li\u003e\n\u003cli\u003eKit includes piston, piston rings, wrist-pin, and circlips\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e**Some models include tin-based anti-friction skirt coating others may not**\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eMoto-House MX - Choice of Champions - Best Motocross Shop in Central Florida \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"ProX","offers":[{"title":"96.95 A. \/ STD 12.8:1 YAM \/ 2018-2019","offer_id":39332156178515,"sku":"01.2448.A","price":161.47,"currency_code":"USD","in_stock":true},{"title":"96.96 B. \/STD 12.8:1 YAM \/ 2018-2019","offer_id":41169654644819,"sku":"01.2448.B","price":161.47,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/pro-x-piston-forged-kit-2018-2019-yamaha-yz450f-yz450fx-and-wr450f-486959.jpg?v=1735459747"},{"product_id":"pro-x-piston-kit-1997-2001-yamaha-yz1125-piston-ring-c-clips-wrist-pin","title":"ProX Piston Kit Yamaha YZ125 1997-2001 Moly Coated 2-Stroke","description":"\u003ch2\u003eProX Piston Kit Yamaha YZ125 1997-2001 Moly Coated \u003c\/h2\u003e\n\u003cp\u003eThe ProX Piston Kit is a premium, Japanese-manufactured solution designed to restore the power and reliability of your 1997-2001 Yamaha YZ125. These pistons are cast from a high-silicon-content aluminum alloy that meets or exceeds original equipment standards, then CNC-machined to extremely close tolerances. This ensures a perfect fit and consistent performance for your 125cc 2-stroke engine.\u003c\/p\u003e\n\u003cp\u003eTo reduce friction and extend engine life, this piston features a specialized Moly Skirt Coating. When you buy ProX Piston Kit components, you are getting a complete top-end solution that includes the piston, ring kit, wrist pin, and circlips. This is the ideal YZ125 replacement piston kit or YZ125 top end service kit for riders who want OEM-level quality with race-ready precision.\u003c\/p\u003e\n\u003ch3\u003e🔹Top Features ProX Piston Kit\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eJapanese Engineering:\u003c\/b\u003e Manufactured in Japan and designed specifically to be a high-performance OEM replacement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMoly Coated Skirt:\u003c\/b\u003e Features a Moly-coated skirt to reduce friction, minimize wear, and improve heat dissipation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePrecision Machining:\u003c\/b\u003e Cast from high-silicon aluminum alloy and CNC-machined to extremely tight tolerances for maximum reliability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eComplete Kit:\u003c\/b\u003e Includes the piston, ring kit, wrist pin, and circlips—everything needed for a top-end refresh.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e🔹Fitment List\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1997 Yamaha YZ125\u003c\/li\u003e\n\u003cli\u003e1998 Yamaha YZ125\u003c\/li\u003e\n\u003cli\u003e1999 Yamaha YZ125\u003c\/li\u003e\n\u003cli\u003e2000 Yamaha YZ125\u003c\/li\u003e\n\u003cli\u003e2001 Yamaha YZ125\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003eQ: \u003cb\u003eWill this ProX Piston Kit fit my 1999 Yamaha YZ125?\u003c\/b\u003e\u003cbr\u003eYes, the 01.2217.C is specifically designed to fit the Yamaha YZ125 from 1997 through 2001.\u003c\/p\u003e\n\u003cp\u003eQ: \u003cb\u003eWhat does \"Size C\" mean for this YZ125 piston?\u003c\/b\u003e\u003cbr\u003eSize C (53.97mm) is a precision-graded standard bore piston used to account for minor cylinder wear, ensuring the perfect piston-to-wall clearance.\u003c\/p\u003e\n\u003cp\u003eQ: \u003cb\u003eIs this a complete YZ125 service kit for the top end?\u003c\/b\u003e\u003cbr\u003eThis kit includes the piston, rings, pin, and clips. We recommend pairing it with a top-end gasket set for a complete engine service.\u003c\/p\u003e\n\u003cp\u003e🚀 Restore the compression and snap of your YZ125. Order your ProX piston kit today for fast delivery.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eMoto-House MX – Choice of Champions\u003c\/b\u003e – is located in Clermont\/Montverde, FL. the best motocross shop in Central Florida.\u003c\/p\u003e","brand":"Pro-X","offers":[{"title":"53.95 mm \/ 1997-2001 A Piston YZ125","offer_id":40296887517267,"sku":"01.2217.A","price":121.95,"currency_code":"USD","in_stock":true},{"title":"53.96 mm \/ 1997-2001 B piston YZ125","offer_id":40296887550035,"sku":"01.2217.B","price":121.95,"currency_code":"USD","in_stock":true},{"title":"Wrist Pin Bearing - Hot Rods \/ 1997-2001 YZ125","offer_id":40296887582803,"sku":"","price":24.94,"currency_code":"USD","in_stock":true},{"title":"53.97 mm \/ 1997-2001 C piston YZ125","offer_id":40296894529619,"sku":"01.2217.C","price":121.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/pro-x-piston-kit-1997-2001-yamaha-yz125-piston-ringc-clips-wrist-pin-793754.jpg?v=1735459809"},{"product_id":"prox-piston-kit-yamaha-yz125-yz125x-05-22-moly-coated-53-95mm-53-97mm","title":"ProX Piston Kit Yamaha YZ125 YZ125X 05-22 Moly Coated 53.95mm-53.97mm","description":"\u003ch2\u003e✨ProX Piston Kit Yamaha YZ125 YZ125X 05-22 Moly Coated 53.95mm-53.97mm\u003c\/h2\u003e\n\u003cp\u003eThe ProX 01.2225 Series Piston Kit is the industry standard for maintaining the high-revving performance of your Yamaha YZ125 or YZ125X. Manufactured in Japan, these pistons are designed as a direct OEM replacement, cast from a high-silicon-content aluminum alloy that handles the extreme heat of 2-stroke racing. To ensure maximum engine life, each piston is CNC-machined to extremely close tolerances and features a Moly-coated skirt to reduce internal friction.\u003c\/p\u003e\n\u003cp\u003eAvailable in precise graded sizes—Size A (53.95mm), Size B (53.96mm), and Size C (53.97mm)—this kit allows you to maintain the perfect piston-to-cylinder clearance as your Nikasil bore wears over time. When you buy ProX Piston Kit components, you are getting a complete top-end package including the piston, ring kit, wrist pin, and circlips. This is the go-to YZ125 replacement piston kit or YZ125X top end service kit for riders who demand factory-level reliability.\u003c\/p\u003e\n\u003ch3\u003e🔹Top Features ProX Piston Kit\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eJapanese Precision:\u003c\/b\u003e Engineered and manufactured in Japan to meet or exceed original equipment performance standards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMoly Coated Skirt:\u003c\/b\u003e Advanced coating minimizes friction and wear during high-RPM operation and the critical break-in period.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eHigh-Silicon Alloy:\u003c\/b\u003e Provides superior thermal stability and strength, preventing piston expansion and seizing in race conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eGraded Sizing:\u003c\/b\u003e Choose from Sizes A, B, or C to perfectly match your cylinder's current wear state for optimal compression.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e🔹Fitment List\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e2005-2021 Yamaha YZ125\u003c\/li\u003e\n\u003cli\u003e2020-2022 Yamaha YZ125X\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e🔹FAQ\u003c\/h3\u003e\n\u003cp\u003eQ: \u003cb\u003eWill this ProX Piston Kit fit my 2021 Yamaha YZ125?\u003c\/b\u003e\u003cbr\u003eYes, the 01.2225 series fits all Yamaha YZ125 models from 2005 to 2021 and YZ125X models through 2022.\u003c\/p\u003e\n\u003cp\u003eQ: \u003cb\u003eShould I buy the Size A, B, or C piston for my YZ125?\u003c\/b\u003e\u003cbr\u003eSize A (53.95mm) is for new or freshly plated cylinders. Size B (53.96mm) and Size C (53.97mm) are used to compensate for minor cylinder wear to maintain proper compression.\u003c\/p\u003e\n\u003cp\u003eQ: \u003cb\u003eIs this a complete YZ125X top end service kit?\u003c\/b\u003e\u003cbr\u003eThis kit includes the piston, rings, wrist pin, and circlips. We recommend adding a top-end gasket set for a complete engine refresh.\u003c\/p\u003e\n\u003cp\u003e🚀 Keep your 125 screaming with a fresh top end. Order your ProX piston kit today and experience the choice of champions.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eMoto-House MX – Choice of Champions\u003c\/b\u003e – is located in Clermont\/Montverde, FL. the best motocross shop in Central Florida.\u003c\/p\u003e","brand":"ProX","offers":[{"title":"53.95\/STD","offer_id":42082520924243,"sku":"01.2225.A","price":109.99,"currency_code":"USD","in_stock":true},{"title":"53.96\/STD","offer_id":42082520989779,"sku":"01.2225.B","price":109.99,"currency_code":"USD","in_stock":true},{"title":"53.97\/STD","offer_id":42082521022547,"sku":"01.2225.C","price":110.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/prox-oem-replacement-piston-kit-2005-2021-yamaha-yz125-and-2020-2022-yamaha-yz125x-808343.jpg?v=1735460473"},{"product_id":"prox-oem-replacement-cast-piston-kit-1999-2023-yamaha-yz250-yz250x","title":"ProX OEM Replacement Cast Piston Kit - 1999-2023 Yamaha YZ250, YZ250X","description":"\u003ch2\u003e\u003cstrong\u003e✨ ProX OEM Replacement Cast Piston Kit for 1999-2023 Yamaha YZ250, YZ250X – Upgrade Your Ride Today!\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eRevitalize your 1999-2023 Yamaha YZ250, YZ250X with the \u003cstrong\u003eProX OEM Replacement Cast Piston Kit\u003c\/strong\u003e, the perfect choice for riders who demand top-notch performance. Manufactured in Japan to \u003cstrong\u003eexceed OEM standards\u003c\/strong\u003e, this piston kit is built for precision and reliability, making it the ideal solution for your bike's top-end rebuild.\u003c\/p\u003e\n\u003ch3\u003e➡️ Why Choose the ProX Piston Kit?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM-Perfect Fit:\u003c\/strong\u003e Specifically designed for your 1999-2023 Yamaha YZ250, YZ250X, guaranteeing a seamless replacement and optimal performance.\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium Materials:\u003c\/strong\u003e Cast from high-silicon-content aluminum alloy, offering unmatched strength, durability, and heat resistance.\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Engineering:\u003c\/strong\u003e CNC-machined to extremely tight tolerances, ensuring maximum power output and smoother operation.\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Kit:\u003c\/strong\u003e Comes with everything you need for a quick and easy installation—\u003cstrong\u003episton, rings, wrist pin, and circlips\u003c\/strong\u003e.\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAffordable Quality:\u003c\/strong\u003e Get all the benefits of OEM performance without the hefty price tag.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e➡️ Proven Performance for Enthusiasts\u003c\/h3\u003e\n\u003cp\u003eProX is a trusted name in the industry, known for delivering \u003cstrong\u003ehigh-quality, dependable replacement parts\u003c\/strong\u003e that keep your bike running strong. Whether you're hitting the track or trail, this piston kit ensures your YZ250 is always ready to perform at its best.\u003c\/p\u003e\n\u003ch3\u003e✅ Fitment:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e2003-2008 Suzuki RM250\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e1999-2023 Yamaha YZ250\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e2016-2023 Yamaha YZ250X\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e🚀 Don’t Wait—Upgrade Now!\u003c\/h3\u003e\n\u003cp\u003eRestore your Yamaha YZ250's peak performance with the ProX OEM Replacement Cast Piston Kit. \u003cstrong\u003eAct now\u003c\/strong\u003e and get back on the track with confidence!\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eClick \"Buy Now\"\u003c\/strong\u003e to secure your ProX Piston Kit today!\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" title=\"Yamaha YZ250 and YZ250X Performance Parts Collection at Moto-House MX\" href=\"https:\/\/motohousemx.com\/collections\/to-house-mx\" target=\"_blank\"\u003eYamaha YZ250 and YZ250X Performance Parts Collection at Moto-House MX\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMoto-House MX - Choice of Champions\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e- Located in Clermont\/Groveland Fl. The best Motocross shop in Central Florida \u003c\/p\u003e","brand":"ProX","offers":[{"title":"66.36 mm","offer_id":42253831438419,"sku":"01.2321.B","price":115.99,"currency_code":"USD","in_stock":true},{"title":"66.37 mm","offer_id":42253831471187,"sku":"01.2321.C","price":129.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/prox-oem-replacement-cast-piston-kit-1999-2023-yamaha-yz250-yz250x-974949.png?v=1735460469"},{"product_id":"prox-01-2412-b-piston-kit-for-4-stroke-2012-2013-yamaha-yz250f-76-96-mm","title":"PROX - 01.2412.B - Piston Kit for 4-Stroke - 2012-2013 Yamaha YZ250F (76.96 mm)","description":"\u003ch2\u003eProX Piston Kit Yamaha YZ250F (2012-2013) 76.96mm Standard Bore 01.2412.B\u003c\/h2\u003e\n\u003cp\u003eThe ProX 01.2412.B Piston Kit offers a professional-grade, economical alternative to expensive OEM parts for your Yamaha YZ250F. Manufactured in Japan by reputable Original Equipment Manufacturers, these pistons are precision-machined on state-of-the-art CNC equipment to meet ProX's exact high-quality standards. If you are looking to \u003cb\u003ebuy ProX Piston Kits\u003c\/b\u003e to restore factory performance and reliability, this standard-bore kit is the industry-leading choice for your 2012-2013 machine.\u003c\/p\u003e\n\u003cp\u003eThis kit features a 13.5:1 compression ratio and is crafted from a low-expansion, low-friction alloy designed to withstand the high-torque demands of 4-stroke racing. It serves as the ultimate \u003cb\u003eYZ250F replacement piston\u003c\/b\u003e, coming complete with the piston, rings, wrist pin, and circlips for a comprehensive top-end refresh. The \u003cb\u003e01.2412.B Piston service kit\u003c\/b\u003e uses an OEM-style tin-based coating to assist with the initial wear-in process, ensuring your engine runs smoothly from the first start.\u003c\/p\u003e\n\u003ch3\u003eTop Features ProX Piston Kit\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eStandard Bore Size: 76.96mm (B-Size) for precise cylinder wall clearance\u003c\/li\u003e\n\u003cli\u003eCompression Ratio: 13.5:1 for optimized 4-stroke power delivery\u003c\/li\u003e\n\u003cli\u003eAdvanced Materials: Made with low-expansion, low-friction alloy for increased durability\u003c\/li\u003e\n\u003cli\u003ePrecision Machining: CNC-machined to extremely close tolerances for a factory fit\u003c\/li\u003e\n\u003cli\u003eTin-Based Coating: OEM-style coating aids the wear-in process and reduces scuffing\u003c\/li\u003e\n\u003cli\u003eComplete Package: Includes high-quality piston, rings, wrist pin, and circlips\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment List\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e2012 Yamaha YZ250F\u003c\/li\u003e\n\u003cli\u003e2013 Yamaha YZ250F\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eQ: What is the difference between a \"Size A\" and \"Size B\" ProX piston?\u003c\/b\u003e\u003cbr\u003eSize B (76.96mm) is 0.01mm larger than Size A. It is typically used once the cylinder has some minor wear to maintain the correct piston-to-cylinder wall clearance according to manufacturer specs.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: Does this ProX kit include the top-end gaskets?\u003c\/b\u003e\u003cbr\u003eNo, this kit includes the piston, rings, pin, and clips only. We recommend purchasing a separate top-end gasket kit to ensure a complete and leak-free installation.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: Is this a forged or cast piston?\u003c\/b\u003e\u003cbr\u003eThe ProX 01.2412.B is a high-quality forged piston, designed to offer superior strength and heat resistance compared to standard cast alternatives.\u003c\/p\u003e\n\u003cp\u003eRestore your machine's compression and power with the same technology used by major Japanese manufacturers. Ready to ship and race-proven.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eMoto-House MX – Choice of Champions\u003c\/b\u003e – is located in Clermont\/Montverde, FL. the best motocross shop in Central Florida.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/motohousemx.com\/collections\/yamaha-yz250f-yz250fx-performance-parts-and-accessories\" title=\"Yamaha YZ250F, YZ250FX Performance Parts and Accessories | Moto-House MX\" rel=\"noopener\" target=\"_blank\"\u003e\u003cstrong\u003eYamaha YZ250F, YZ250FX Performance Parts and Accessories\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"ProX","offers":[{"title":"Default Title","offer_id":42467744972883,"sku":"01.2412.B","price":169.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/prox-012412b-piston-kit-for-4-stroke-2012-2013-yamaha-yz250f-7696-mm-922993.jpg?v=1738517307"}],"url":"https:\/\/motohousemx.com\/collections\/prox-pistons-yamaha.oembed","provider":"Moto-House MX","version":"1.0","type":"link"}