Yamaha Oil Level Plug 7BX-E536A-20-00. Overview. The Yamaha Oil Level Plug 7BX-E536A-20-00 is a genuine original equipment manufacturer component designed to securely seal the oil system while supporting accurate oil level maintenance. This plug plays a vital role in preventing oil leaks and ensuring proper lubrication for reliable engine performance.. Manufactured to Yamaha's exact specifications, this oil level plug provides a precise fit and dependable sealing capability. It is an ideal repla