There are several reasons why your pour-over coffee might taste sour:

1. **Under-extraction**: If you're not brewing your coffee for long enough or if the water temperature is too low, the coffee may be under-extracted, which can result in a sour taste. Try increasing the brewing time or using hotter water to see if that helps.

2. **High acidity in the beans**: Some coffee beans are naturally more acidic than others, and this can result in a sour taste. If you find that your coffee is consistently sour, you may want to try a different type of bean with lower acidity.

3. **Improper grind size**: If your coffee grounds are too coarse, the water will pass through too quickly and result in under-extraction. If the grounds are too fine, the water will pass through too slowly and result in over-extraction. Both of these scenarios can result in a sour taste. Make sure you're using the correct grind size for your brew method.

4. **Water quality**: The quality of your water can also affect the taste of your coffee. If your water is too hard or has a high mineral content, it can result in a sour taste. Using filtered or purified water may help.

5. **Brewing method**: The pour-over method requires a bit of skill to get right. If you're not using the correct technique, it can result in under- or over-extraction, which can cause a sour taste. Make sure you're using the correct pouring technique and brewing method for your equipment.

By adjusting these factors, you may be able to improve the taste of your pour-over coffee and reduce the sourness.
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