Running at the right temperature maximizes performance. A failed or failing thermostat can cause an engine to run at outside of its optimum temperature and adversely affect performance and efficiency. Getting back to the right temperature can be as simple as replacing the thermostat. Sierra makes sourcing parts for the job easy by packaging the thermostat and gasket for an easy out the box installation. Each Sierra part is engineered to meet or exceed Yamaha specifications to assure boaters and technicians it will fit right the first time and restore function to OEM specifications. Key Features Thermostat meets or exceeds manufacturer specifications Temperature rating of 122F (50C) Complete kit includes thermostat and gasket to eliminate time spent sourcing individual parts How to find the thermostat kit you need Select your thermostat kit by locating the OEM part number in the table below. If you don't know the OEM part number, please visit ourEngine Parts Selector, where you can search by engine make, model, horsepower, serial number and year of manufacturer. Application`OEM Part NumberMallory9-43177Model Compatibility Chart115 hp Models130hp Models150hp Models175hp Models200hp Models225hp Models115 (1991-02),130 (1991-02),150 (1991-02),175 (1991-95, 97),200 (1991-98),225 (1991-97),C115 (1991-99),L130 (1991-00),C150 (1996-99),P175 (1994-99),L200 (1991-99),V225 (1998-99)P115 (1993-96),S130 (1996-99),L150 (1991-99),V175 (2000),P200 (1991-99),—S115 (1996-99),—P150 (1991-99),Z175 (2001-02),S200 (1996-99),———S150 (1996-99),—V200 (1998-99),———V150 (2000-02),—Z200