1. Stuck Float Or Float Valve:
- Common issue if the bike has been unused for a long time.
- When stuck, excessive fuel flows into the carburetor, causing the overflow to drain excess fuel.
- Inspect and clean carburetor, replace float valve if needed.
2. Incorrect Float Height:
- If the float height is too high, fuel will overflow into the overflow line.
- Check and adjust the float height according to the specific model specifications.
3. Damaged Float Bowl Gasket:
- If the gasket is worn, cracked, or compressed, it can cause poor sealing.
- Replace the float bowl gasket to ensure proper sealing.
4. Defective Float:
- Float failure can also lead to overflow issues.
- Test and replace the float if needed.
5. Dirty or Clogged Main Jet:
- A blocked main jet restricts proper fuel flow, causing overflow.
- Clean the carburetor and pay attention to the main jet, unclog or replace if necessary.
6. Incorrect Fuel Level Setting:
- Excessive fuel in the carburetor's float bowl can cause overflow.
- Ensure proper fuel level adjustments according to the manufacturer's recommendations.
7. Blocked Fuel Shut Off Valve:
- If the fuel shutoff valve is blocked, it may not completely shut off fuel flow, leading to overflow.
- Clean and inspect the fuel valve.
Note: Before performing any repairs or adjustments, make sure to consult the specific technical documentation for your Yamaha WR250 model to ensure proper safety and accuracy.
