Amazon's search ranking algorithm is a complex system, in which many factors affect the weight and ranking of products, including but not limited to product titles, descriptions, keywords, sales volume, reviews, etc. If you change the main image of a product, this may have a certain impact on the weight and ranking of the product, but the specific extent of the impact is difficult to predict, because Amazon's ranking algorithm is a trade secret and there is no clear public regulation.

Generally speaking, changing the main image may have an impact on the click-through rate and conversion rate of the product, thereby affecting the ranking of the product. If the main image you change can better attract consumers' attention and increase click-through rate and conversion rate, it may have a positive impact on the ranking of the product. However, if the main image you change fails to attract consumers' attention and instead causes a decrease in click-through rate and conversion rate, it may have a negative impact on the ranking of the product.

Therefore, when changing the main image of a product, it is recommended that you choose a main image that can better attract consumers based on the actual situation of the product and market demand, and monitor and analyze to determine the actual impact after changing the main image. At the same time, you can also improve the ranking of the product in other ways, such as optimizing the product title and description, adding keywords, improving product quality and service, etc.