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My Yamaha at times it backfire from the carburetor and exhaust turning yellow?

It sounds like you're experiencing a common issue with your Yamaha engine - a rich fuel mixture. Here's a breakdown of the problem and possible solutions:

Why is your Yamaha backfiring and exhaust turning yellow?

* Rich Fuel Mixture: Your engine is getting too much fuel, which can cause incomplete combustion. This leads to:

* Backfiring: Unburnt fuel ignites in the exhaust system, causing a loud popping sound.

* Yellow Exhaust: The yellow color indicates the presence of unburnt hydrocarbons in the exhaust, a sign of a rich mixture.

Possible Causes:

1. Dirty Carburetor: A clogged carburetor jet restricts airflow, leading to a rich mixture.

2. Fuel System Problems: Clogged fuel filters or lines can hinder fuel flow, causing an imbalance.

3. Faulty Air/Fuel Mixture Screw: The mixture screw controls the air-fuel ratio. If it's adjusted incorrectly, it can lead to a rich mixture.

4. Faulty Fuel Pump: A malfunctioning fuel pump can deliver excessive fuel to the carburetor.

5. Choke Stuck On: If the choke is engaged when it shouldn't be, it will enrich the mixture.

6. Incorrect Fuel: Using the wrong type of fuel can cause issues. Check your owner's manual for the correct octane rating.

Solutions:

1. Clean the Carburetor: Thoroughly clean the carburetor using a carburetor cleaning kit. Remove any debris and ensure the jets are clear.

2. Inspect Fuel System: Check the fuel filters and lines for blockages. Replace them if necessary.

3. Adjust Air/Fuel Mixture Screw: Adjust the mixture screw (refer to your owner's manual for proper adjustments) to achieve the correct air-fuel ratio.

4. Test Fuel Pump: If you suspect a faulty fuel pump, test it for proper operation. Replace it if needed.

5. Check Choke: Make sure the choke is fully disengaged when the engine is running.

6. Correct Fuel Type: Ensure you're using the correct fuel type for your Yamaha.

Important:

* Consult Your Owner's Manual: Refer to your Yamaha's owner's manual for detailed information on carburetor adjustment and troubleshooting.

* Seek Professional Help: If you're not comfortable performing these repairs yourself, seek assistance from a qualified mechanic.

By addressing the cause of the rich mixture, you can resolve the backfiring and yellow exhaust issues on your Yamaha.

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