If your coolant reservoir is almost empty while the radiator is full on your Yamaha FZ-07, it indicates a potential issue with the coolant circulation or system. Here are a few possible reasons for this situation:
Coolant Leak: There might be a coolant leak in the system, causing the coolant to escape and not properly flow back into the reservoir. Check for any visible signs of leakage, such as puddles under the bike or wet areas around the hoses, radiator, or water pump.
Air Pocket: An air pocket trapped in the cooling system can disrupt the coolant flow and cause an imbalance between the radiator and the reservoir. During a coolant flush, air can get trapped in the system if not properly bled. Try performing a thorough bleeding procedure to remove any air pockets.
Faulty Radiator Cap: The radiator cap is responsible for maintaining the correct pressure in the cooling system. If the cap is faulty or not sealing properly, it can lead to coolant loss and an imbalance between the radiator and reservoir. Consider inspecting and potentially replacing the radiator cap.
Overheating: If your bike has experienced overheating recently, the excess pressure might have caused coolant to be expelled from the reservoir. Overheating can be caused by various factors, such as a malfunctioning thermostat, blocked radiator, or insufficient coolant.
To resolve the issue, it is recommended to:
- Inspect the entire cooling system for leaks and address any identified issues.
- Perform a proper bleeding procedure to remove any trapped air pockets.
- Verify the condition of the radiator cap and replace if necessary.
- Check for any signs of overheating and address the root cause.
If you are unsure or unable to diagnose and fix the problem yourself, it is advisable to consult a professional mechanic or take your motorcycle to a Yamaha service center for a thorough inspection and repair.