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Check the listing for details. Genuine OEM Thermostat Fits Yamaha YP 400 R X-Max. Condition: New. Listed at 127.59 USD. A motorcycle Thermostat is a crucial component in your Yamaha YP 400 R X-Max 's cooling system. It regulates the flow of coolant between the engine and the radiator, ensuring that your motorcycle's engine operates within the optimal temperature range.