Yamaha Carburetor Assembly 1 7BN-E4101-20-00. Overview. The Yamaha Carburetor Assembly 1 7BN-E4101-20-00 is a high-quality replacement component designed to optimize the performance of your marine engine. Precisely engineered to meet Yamaha's exact specifications, this carburetor assembly ensures a perfect fit and seamless integration with your engine system.. It effectively addresses common issues such as poor idling, fuel leaks, and reduced engine power. By delivering a balanced fuel-air mixtu