{"product_id":"marine-thermostat-50c-for-yamaha-outboards-replaces-60v-12411-00-fits-f115-vz250-z300-sierra-18-3525","title":"Sierra Thermostat 18-3525 for Yamaha 2-Stroke Outboards VZ200, V225, VZ250","description":"\u003cp\u003eThe Sierra 18-3525 is a replacement cooling system thermostat engineered for Yamaha 2-stroke outboard engines. It regulates engine operating temperature by controlling coolant flow through the cooling system, helping the engine reach and maintain proper running temperature for efficient performance and long-term reliability. This thermostat is a direct application-specific part for the Yamaha VZ200 (2005-09), V225 (2003-09), and VZ250 (2003-09) outboards, and each of these engines requires two thermostats per engine for complete cooling system coverage.\u003c\/p\u003e\u003cp\u003eAs a cooling system wear item, the thermostat should be inspected and replaced as part of routine outboard maintenance or whenever overheating, erratic temperature gauge readings, or reduced engine performance point to a stuck or failing thermostat. Installing the correct application-specific thermostat is important, since Yamaha 2-stroke outboards use different Sierra thermostat part numbers depending on model and year.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-3525\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Thermostat\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Type:\u003c\/strong\u003e Yamaha 2-Stroke Outboard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity Per Engine:\u003c\/strong\u003e 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Copper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.11 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282339364\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eYamaha VZ200, 2005-09\u003c\/li\u003e\n\u003cli\u003eYamaha V225, 2003-09\u003c\/li\u003e\n\u003cli\u003eYamaha VZ250, 2003-09\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eNo OEM cross-reference numbers listed for this part number.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-3525 thermostat do?\u003c\/strong\u003e It regulates coolant flow in the cooling system of a Yamaha 2-stroke outboard so the engine reaches and holds its proper operating temperature. Part number 18-3525 is the Sierra replacement thermostat for this application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-3525 fit a Yamaha VZ200 outboard?\u003c\/strong\u003e Yes, thermostat 18-3525 is the listed application for the Yamaha VZ200 covering model years 2005-09.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich Yamaha outboard models use thermostat 18-3525?\u003c\/strong\u003e Thermostat 18-3525 applies to the Yamaha VZ200 (2005-09), V225 (2003-09), and VZ250 (2003-09).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many thermostats does my Yamaha 2-stroke outboard need?\u003c\/strong\u003e Two. The VZ200, V225, and VZ250 applications for the Sierra 18-3525 each require a quantity of 2 thermostats per engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs a gasket included with the Sierra 18-3525 thermostat?\u003c\/strong\u003e No separate gasket or thermostat kit number is listed for part 18-3525, so it is supplied as the thermostat only.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the weight of the Sierra 18-3525 thermostat?\u003c\/strong\u003e It weighs 0.11 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill 18-3525 fit a Yamaha V225 from 2003 to 2009?\u003c\/strong\u003e Yes, the V225 model years 2003-09 use thermostat 18-3525, with two units required per engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat years does the VZ250 application cover for part 18-3525?\u003c\/strong\u003e The Yamaha VZ250 application for thermostat 18-3525 covers model years 2003-09.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is 18-3525 different from the Sierra 18-3540 thermostat?\u003c\/strong\u003e 18-3525 is the thermostat for the Yamaha VZ200 (2005-09), V225 (2003-09), and VZ250 (2003-09), while 18-3540 is a separate part number used on other Yamaha 200-250 hp applications and comes with its own matching gasket and kit numbers. The two are not interchangeable across applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3525 a genuine Yamaha part or aftermarket?\u003c\/strong\u003e Sierra 18-3525 is an aftermarket replacement thermostat manufactured by Sierra for the specified Yamaha 2-stroke outboard applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if my outboard's thermostat needs replacing?\u003c\/strong\u003e Signs include engine overheating, erratic temperature gauge readings, or reduced cooling performance; on the applicable Yamaha VZ200, V225, or VZ250 outboards, the Sierra 18-3525 is the correct replacement thermostat to install.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988150857947,"sku":"SIE-18-3525","price":37.21,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3525__30535.1655148687.500.750.jpg?v=1785188562","url":"https:\/\/www.goodvibesmarina.com\/products\/marine-thermostat-50c-for-yamaha-outboards-replaces-60v-12411-00-fits-f115-vz250-z300-sierra-18-3525","provider":"Good Vibes Marina","version":"1.0","type":"link"}