{"product_id":"naraku-heavy-duty-wrist-pin-bearing-12x17x13mm-137-73","title":"Naraku Heavy Duty 12mm Wrist Pin Bearing: 50cc 2T","description":"\u003ch2\u003eHigh-RPM Reliability: Naraku Heavy Duty Small End Bearing\u003c\/h2\u003e\u003cp\u003eEnsure the heart of your engine remains stable with the \u003cstrong\u003eNaraku Heavy Duty Wrist Pin Bearing\u003c\/strong\u003e. Engineered for 50cc 2-stroke engines, this \"small end\" needle bearing features a reinforced silver-plated cage designed to withstand the extreme thermal stress and high rotational speeds of performance tuning. Whether you are performing a routine top-end refresh or installing a high-compression cylinder kit, this bearing provides the precision fit and reduced friction necessary to prevent catastrophic engine failure.\u003c\/p\u003e\u003ch3\u003eTechnical Performance Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy Duty Silver Cage:\u003c\/strong\u003e Specifically designed for superior heat dissipation and reduced friction compared to standard steel-caged bearings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Needle Rollers:\u003c\/strong\u003e Features high-grade hardened steel rollers for maximum load-bearing capacity and smooth piston articulation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized for Performance:\u003c\/strong\u003e The ideal choice for \"Sport\" and \"Mid-Race\" 70cc kits where crankshaft RPM exceeds factory limits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM-Spec Dimensions:\u003c\/strong\u003e A direct 12x17x13mm replacement for a wide range of European and Japanese 2-stroke scooters.\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eComprehensive Fitment Guide\u003c\/h3\u003e\u003cp\u003eThis bearing fits a massive variety of \u003cstrong\u003e50cc 2-Stroke\u003c\/strong\u003e models using a 12mm wrist pin:\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"text-align: left;\"\u003eBrand\u003c\/th\u003e\n\u003cth style=\"text-align: left;\"\u003eCompatible Models\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVespa \/ Piaggio\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eET2, LX\/LXV, Primavera, Sprint 50, Fly 50, Typhoon 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHonda\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDio, Elite 50 (1994+ \/ AF27\/AF28\/AF34\/AF35)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAprilia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSR 50, Mojito, Scarabeo, Sport City One 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eKymco \/ SYM\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSuper 9, Agility, Like 50, DD 50, Fiddle I, Jet 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVintage Vespa\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePK 50, V 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003chr\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner Diameter:\u003c\/strong\u003e 12mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 17mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 13mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCage Type:\u003c\/strong\u003e Silver-Plated Heavy Duty\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003cblockquote\u003e\n\u003cstrong\u003eMechanic's Note:\u003c\/strong\u003e The wrist pin bearing is the most stressed bearing in a 2-stroke engine.\u003c\/blockquote\u003e\u003cblockquote\u003e\n\u003cstrong\u003eSafety Warning:\u003c\/strong\u003e Never reuse an old wrist pin bearing during a top-end rebuild.\u003c\/blockquote\u003e\u003cblockquote\u003e\n\u003cstrong\u003ePro Tip:\u003c\/strong\u003e When installing, liberally coat the bearing in high-quality \u003cstrong\u003e\u003ca href=\"https:\/\/www.scooterworks.com\"\u003e2-Stroke Racing Oil\u003c\/a\u003e\u003c\/strong\u003e to ensure immediate lubrication upon the first start-up. Check your \u003cstrong\u003e\u003ca href=\"https:\/\/www.scooterworks.com\"\u003ePiston Circlips\u003c\/a\u003e\u003c\/strong\u003e for tension while you're in there!\u003c\/blockquote\u003e\u003cp style=\"font-size: 0.85em; color: #666;\"\u003e\u003cstrong\u003eSKU:\u003c\/strong\u003e 137-73 \u003cbr\u003e\u003cstrong\u003eVendor:\u003c\/strong\u003e Naraku\u003c\/p\u003e","brand":"Naraku","offers":[{"title":"Default Title","offer_id":49985983676696,"sku":"137-73","price":11.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/1728\/1816\/files\/617288_ae6c5fbb-6d5b-4d2a-8458-f88411b06fc6.jpg?v=1744827296","url":"https:\/\/www.scooterworks.com\/products\/naraku-heavy-duty-wrist-pin-bearing-12x17x13mm-137-73","provider":"Scooterworks USA, LLC","version":"1.0","type":"link"}