⚠️ Safety Warning: Never open the radiator cap while the engine is hot. The system is pressurized, and opening it can cause boiling coolant to spray out, resulting in serious burns. Always allow the engine to cool completely before performing any maintenance on the cooling system.
Yamaha YZF-R125 Cooling System Guide
Maintaining the cooling system is essential for the YZF-R125's high-revving engine. This guide centralizes resources for the radiator, water pump, and temperature monitoring.
Core Components & Maintenance
Radiator & Fan: The radiator dissipates heat, assisted by an electric fan that triggers at high temperatures. You can find detailed operation and testing info
here Water Pump: This circulates coolant through the engine. If you notice leaks near the pump housing or a rise in engine temperature, the pump may need a rebuild. See the removal and stripping guide
here Coolant Temperature Sensor (CTS): This sensor monitors the engine's heat level and informs the ECU. A guide for testing the CTS can be found
here
Antifreeze & Fluids
Testing: Regularly check the concentration of your antifreeze to ensure it provides adequate protection against both freezing and corrosion. See the testing guide
here Bleeding the System: When refilling coolant, ensure you bleed all air from the system to prevent "air locks" which can cause localized overheating.
Parts & Tools
Replacement Sensors:
YZF-R125 Temp Sensors on eBay UK Water Pump Kits:
Water Pump Rebuild Kits on eBay UK
Radiator and cooling fan we have a post on the cooling fans here link
water pump below we have a post on removal stripping on these here Link
Testing your motorbike for antifreeze post here
Testing the coolent temperature sensor see entire process in video below
Buy new temp sensor here on Ebay UK
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