{"product_id":"yamaha-74","title":"Yamaha Outboard Nylon Lock Nut - 90185-05904-00","description":"\u003cp\u003eThe \u003cstrong\u003eYamaha 90185-05904-00\u003c\/strong\u003e is a genuine Yamaha OEM \u003cstrong\u003enylon self-locking nut\u003c\/strong\u003e used in select Yamaha outboard assemblies where the factory parts diagram calls for this exact fastener. This lock nut uses an internal nylon insert to help resist loosening from vibration, making it suitable for small hardware locations such as water inlet screens, linkage brackets, tiller components, and other diagram-specific mounting points.\u003c\/p\u003e\n\u003cp\u003eUse this nut only where the Yamaha parts diagram specifically calls for \u003cstrong\u003e90185-05904-00\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Yamaha OEM locking nut.\u003c\/li\u003e\n\u003cli\u003eYamaha part number: \u003cstrong\u003e90185-05904-00\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eAlternate formatting: \u003cstrong\u003e90185-05904\u003c\/strong\u003e and \u003cstrong\u003e901850590400\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eNylon insert locking design helps resist vibration loosening.\u003c\/li\u003e\n\u003cli\u003eCommonly used in small Yamaha outboard hardware locations where specified.\u003c\/li\u003e\n\u003cli\u003eListed weight reference: \u003cstrong\u003e0.004 lb\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eSuitable for replacing missing, corroded, loosened, stripped, or previously removed lock nuts in factory-specified locations.\u003c\/li\u003e\n\u003cli\u003eOften used with matching Yamaha hardware shown in the same diagram.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eApplication Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eCommon application context includes select Yamaha 2-stroke and 4-stroke outboards by model, serial number, and diagram location, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSelect \u003cstrong\u003eYamaha 6 HP through 350 HP\u003c\/strong\u003e outboard applications where specified.\u003c\/li\u003e\n\u003cli\u003eLower unit \u003cstrong\u003ewater inlet screen \/ water intake screen\u003c\/strong\u003e mounting locations where the diagram calls for this nut.\u003c\/li\u003e\n\u003cli\u003eTiller handle, steering, throttle, shift, choke, and linkage bracket locations where specified.\u003c\/li\u003e\n\u003cli\u003eSelect lower casing and cowling-related hardware positions where Yamaha calls for \u003cstrong\u003e90185-05904-00\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eApplications using related Yamaha screen screw \u003cstrong\u003e90152-05003-00\u003c\/strong\u003e, where shown together in the factory diagram.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFitment must be confirmed by the exact Yamaha parts diagram before ordering.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eSerial Number Fitment Notice\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eConfirm fitment by Yamaha model code, serial number, horsepower, assembly diagram, thread size, matching screw, and hardware location before ordering. Yamaha uses many similar small lock nuts across outboard assemblies, and similar-looking fasteners can differ in thread, material, height, locking style, and intended service location.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eWhen This Part Needs Replacement\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eReplace this lock nut if the nylon insert is worn, loose, melted, cracked, contaminated, stripped, or no longer grips the screw threads securely. It should also be replaced if the nut has been removed from a vibration-sensitive location such as a lower-unit water screen, control linkage, tiller bracket, or shift hardware location. Reusing a worn nylon lock nut can allow hardware to loosen during operation.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eInstallation Notes\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eInstall this nut only with the correct Yamaha screw or stud shown in the factory diagram. Make sure the threads are clean and undamaged before assembly. Tighten to the Yamaha service-manual specification for the specific location and avoid overtightening small hardware, especially on plastic screens, aluminum lower casings, linkage brackets, and thin mounting tabs.\u003c\/p\u003e\n\u003cp\u003eIf servicing water inlet screens, inspect the screen, screw, threaded hole, and surrounding lower casing while the hardware is removed.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eAlternate\/Superseded Part Numbers\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e90185-05904-00\u003c\/strong\u003e — Yamaha OEM part number\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e90185-05904\u003c\/strong\u003e — alternate catalog formatting\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e901850590400\u003c\/strong\u003e — condensed catalog formatting\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e90185-05002-00\u003c\/strong\u003e — earlier Yamaha reference; verify by model and diagram\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e90185-05M00-00\u003c\/strong\u003e — earlier Yamaha reference; verify by model and diagram\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSEI Marine 98-416-32\u003c\/strong\u003e — aftermarket reference; verify by application and thread before substitution\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eParts Desk Insight\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eSmall lock nuts are easy to overlook, but they are important on marine engines because vibration, salt exposure, and repeated service can weaken the locking insert. For lower-unit water screens and linkage hardware, replacing the nut when it has lost grip helps prevent loose parts, missing screens, and repeat service work.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShipping:\u003c\/strong\u003e Ships same or next day for fast Canada wide shipping. ⚓\u003c\/p\u003e","brand":"YAM","offers":[{"title":"Default Title","offer_id":43564300894244,"sku":"90185-05904-00","price":7.63,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/aa32a2ac-3192-48b3-a865-20b637ea68c9.png?v=1781215000","url":"https:\/\/marisolmarine.com\/products\/yamaha-74","provider":"Marisol Marine Company","version":"1.0","type":"link"}