16077-KG8-901 Bystarter O-Ring - Overview. The 16077-KG8-901 Bystarter O-Ring is an essential rubber sealing component used in Honda marine engine starter systems. It plays a critical role in ensuring a watertight seal within the starter assembly to prevent leaks and maintain proper starter operation. This O-ring supports Honda starter system integrity, ensuring the marine engine can be started reliably every time. Made to match exact factory specifications, this component seamlessly integrates