Maintaining optimal engine performance on your MT-15 V2 or R15 V4 is critical , and the coolant valve plays a important role. A faulty thermostat can lead to overheating , potentially causing costly repairs. https://royalbikes.co.in/products/yamaha-genuine-thermostat-assembly-for-mt-15-r15-v3-v4-oem-bk6-e2410-00