{"product_id":"motorcycle-engine-piston-kit-for-57-4mm-cylinder-diameter-with-combined-oil-ring-aluminum-alloy-piston-and-pin-for-125cc-to-200cc-engines-37mm-total-height-for-replacement-or-rebuild","title":"Motorcycle engine piston kit for 57.4mm cylinder diameter with combined oil ring, aluminum alloy piston and pin for 125cc to 200cc engines, 37mm total height for replacement or rebuild.","description":"\u003ch1\u003e57.4mm Motorcycle Engine Piston Kit with Aluminium Alloy Construction and Combined Oil Ring\u003c\/h1\u003e\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"Motorcycle engine piston kit with ring and pin for 57.4mm cylinder diameter\" src=\"https:\/\/images.seoo.uk\/src\/products\/shopify_export\/US12\/1178\/2025-10-02\/original-image\/03258982-8eb6-4a27-8cd4-952ee0f70f96.webp\"\u003e\u003c\/div\u003e\n\u003cp\u003eThis piston kit provides a core component for the repair or rebuilding of small-displacement motorcycle, moped, or scooter engines. It is designed as a direct replacement for engines with a cylinder bore diameter of 57.4mm, a specification often found in models ranging from 125cc to 200cc. The kit includes the essential mechanical parts: the aluminium alloy piston body, a steel combination oil ring, and the piston pin. It is intended for mechanics, DIY enthusiasts, or workshop professionals undertaking engine servicing where the original piston is worn, damaged, or requires replacement during a rebuild. The specifications are clearly defined, allowing for a straightforward compatibility check against your engine's requirements.\u003c\/p\u003e\n\u003ch2\u003eFeatures and Construction\u003c\/h2\u003e\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"Motorcycle engine piston kit with ring and pin for 57.4mm cylinder diameter\" src=\"https:\/\/images.seoo.uk\/src\/products\/shopify_export\/US12\/1178\/2025-10-02\/original-image\/45554894-b6e8-4116-bbf4-bc54d2626ad6.webp\"\u003e\u003c\/div\u003e\n\u003cp\u003eThe kit's design centres on providing a functional, dimensionally accurate replacement piston assembly for specific small engines. Its construction uses materials standard for this application, and its specifications are focused on mechanical fit and replacement of worn parts.\u003c\/p\u003e\n\u003ch3\u003eMaterial and Build\u003c\/h3\u003e\n\u003cp\u003eThe main piston body is constructed from aluminium alloy, a standard material for motorcycle pistons due to its favourable balance of weight and heat transfer properties. The included piston ring is a steel strip combined oil ring, which utilises a combination ring structure. This design is common in small engines for managing oil control within the cylinder. The piston pin, also included, is the component that connects the piston to the connecting rod.\u003c\/p\u003e\n\u003ch3\u003eSize and Practical Fit\u003c\/h3\u003e\n\u003cp\u003eThe primary dimension for compatibility is the cylinder diameter of 57.4mm. This measurement must match the bore of the engine cylinder for a correct fit. The second key dimension is the total piston height of 37mm, which determines how the piston sits within the cylinder and aligns with the engine case. These two measurements are crucial for verifying that this kit is suitable for your specific engine model before purchase and installation.\u003c\/p\u003e\n\u003ch2\u003eUses and Placement\u003c\/h2\u003e\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"Motorcycle engine piston kit with ring and pin for 57.4mm cylinder diameter\" src=\"https:\/\/images.seoo.uk\/src\/products\/shopify_export\/US12\/1178\/2025-10-02\/original-image\/74a35453-7225-4b5c-953d-91aec4be0423.webp\"\u003e\u003c\/div\u003e\n\u003cp\u003eThis piston kit has a clear, singular purpose: to replace the piston assembly in a compatible internal combustion engine. It is not a universal part and is intended for a specific range of engine sizes and types.\u003c\/p\u003e\n\u003ch3\u003eEvent or Professional Use\u003c\/h3\u003e\n\u003cp\u003eFor professional motorcycle mechanics or small engine repair workshops, this kit serves as a standard replacement part for common engine repairs. It is suitable for use during engine overhaul jobs, top-end rebuilds, or when addressing issues like piston slap, scoring, or ring failure on engines with the matching 57.4mm bore. It provides the central moving part needed to restore compression and proper engine function.\u003c\/p\u003e\n\u003ch3\u003eEveryday Home Use\u003c\/h3\u003e\n\u003cp\u003eFor the experienced DIY motorcyclist or scooter owner, this kit enables at-home engine repair projects. It is a solution for bringing a small-displacement bike back to life after piston-related failure or as part of a planned engine refurbishment to extend the vehicle's life. Its use requires mechanical knowledge, appropriate tools, and adherence to standard engine rebuilding practices for installation.\u003c\/p\u003e\n\u003ch2\u003eBenefits and Buying Value\u003c\/h2\u003e\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"Motorcycle engine piston kit with ring and pin for 57.4mm cylinder diameter\" src=\"https:\/\/images.seoo.uk\/src\/products\/shopify_export\/US12\/1178\/2025-10-02\/original-image\/c048e981-b070-490a-9f49-e2e57a5f3b05.webp\"\u003e\u003c\/div\u003e\n\u003cp\u003eThe value of this product lies in its specificity and function as a replacement component, rather than in aesthetic or performance-enhancing features.\u003c\/p\u003e\n\u003ch3\u003eReuse and Low Maintenance\u003c\/h3\u003e\n\u003cp\u003eAs a replacement part, its core benefit is enabling the continued use of an existing engine block and related components. By replacing a worn piston, the entire engine can be returned to service, which is often more economical and practical than replacing the whole engine or vehicle. The aluminium alloy construction is standard for the application and requires no special maintenance beyond that of any other piston.\u003c\/p\u003e\n\u003ch3\u003eWhy Choose This Product\u003c\/h3\u003e\n\u003cp\u003eChoose this piston kit if you have verified that your engine requires a piston for a 57.4mm cylinder bore with a 37mm total height. It offers a focused solution, providing the necessary piston, pin, and a combined oil ring in one package, which can simplify sourcing parts for a rebuild. It is designed for mechanical restoration, not for performance modification, making it a practical choice for standard repairs and overhauls.\u003c\/p\u003e\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"Motorcycle engine piston kit with ring and pin for 57.4mm cylinder diameter\" src=\"https:\/\/images.seoo.uk\/src\/products\/shopify_export\/US12\/1178\/2025-10-02\/original-image\/d3b8e484-746f-4853-98c5-bb31ddfb2d8c.webp\"\u003e\u003c\/div\u003e","brand":"psdxp6-30","offers":[{"title":"Engine piston","offer_id":54304327729494,"sku":"CJYD195065402BY","price":17.88,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1018\/5352\/8406\/files\/45554894-b6e8-4116-bbf4-bc54d2626ad6.webp?v=1782171254","url":"https:\/\/elmworth.co.uk\/products\/motorcycle-engine-piston-kit-for-57-4mm-cylinder-diameter-with-combined-oil-ring-aluminum-alloy-piston-and-pin-for-125cc-to-200cc-engines-37mm-total-height-for-replacement-or-rebuild","provider":"Elmworth.co.uk","version":"1.0","type":"link"}