{"product_id":"yamaha-piston-1-o-s-0-25-6h4-11635-01-00","title":"Yamaha - Piston 1 o\/s 0.25 - 6H4-11635-01-00","description":"\u003ch3 class=\"disclosure__title h5 mb-0\"\u003e\u003cspan\u003eYamaha Piston 1 O\/S 0.25 – 6H4-11635-01-00\u003c\/span\u003e\u003c\/h3\u003e\n\u003ch3 class=\"disclosure__title h5 mb-0\"\u003e\u003cspan\u003eOEM Oversized Piston for Yamaha Outboard Engine Rebuilds\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe Yamaha - Piston 1 o\/s 0.25 - 6H4-11635-01-00 is an original oversized piston (0.25mm over standard) designed for precision engine rebuilds. Whether you’re restoring performance after cylinder wear or addressing damage, this factory-crafted piston ensures a reliable fit and optimal combustion inside Yamaha outboard engines.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eEngineered to Yamaha’s exact tolerances, it supports long-term durability and smooth power delivery on the water.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 class=\"disclosure__title h5 mb-0\"\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003e0.25mm Oversized Fit\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eIdeal for use when cylinder walls have been honed or rebored beyond standard dimensions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eGenuine Yamaha Part\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eEnsures factory-grade quality, material specs, and tolerances.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eDesigned for Peak Performance\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003ePromotes efficient compression and consistent combustion.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 class=\"disclosure__title h5 mb-0\"\u003e\u003cspan\u003eCompatibility\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003ePart Number: 6H4-11635-01-00\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eFits select Yamaha outboard motors requiring a 0.25mm oversized piston\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eConfirm engine fitment using your Yamaha model’s service manual or parts catalog.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 class=\"disclosure__title h5 mb-0\"\u003e\u003cspan\u003eIdeal Use Cases\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eEngine Rebuilds After Wear\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003ePerfect when cylinder measurements exceed standard spec and require an O\/S piston.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003ePerformance Restoration\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eSupports fuel economy, compression, and reliable operation in aging motors.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eLong-Term Maintenance\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eOEM piston helps prevent engine damage from poor aftermarket alternatives.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eWhy Oversized Piston Quality Matters\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eWhen you're rebuilding your outboard engine, the integrity of each internal part makes a major difference. The Yamaha - Piston 1 o\/s 0.25 - 6H4-11635-01-00 provides the precise dimensions and strength needed to restore original performance while maintaining Yamaha’s renowned reliability. It’s a critical upgrade when your engine block has been machined.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 class=\"disclosure__title h5 mb-0\"\u003e\u003cspan\u003eFrequently Asked Questions\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eWhat does “1 o\/s 0.25” mean for this piston?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eIt means the piston is 0.25mm larger in diameter than the standard size—designed for use in rebored or honed cylinders.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eCan I install this piston in any Yamaha outboard?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eIt must match specific models that require the 6H4-11635-01-00 part. Always check your model’s parts manual for fitment.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eShould I replace anything else when installing a new piston?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eYes. It’s strongly recommended to replace piston rings, gaskets, and inspect connecting rods and bearings during installation to ensure full performance restoration.\u003c\/span\u003e\u003c\/p\u003e","brand":"Yamaha","offers":[{"title":"Default Title","offer_id":46937081020707,"sku":"6H4-11635-01-00","price":109.64,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV254058.jpg?v=1698800171","url":"https:\/\/partsvu.com\/fr\/products\/yamaha-piston-1-o-s-0-25-6h4-11635-01-00","provider":"PartsVu","version":"1.0","type":"link"}