99101-124-0800 Main (#80) Jet - Overview. The 99101-124-0800 Main (#80) Jet is a critical component of the fuel delivery system in Honda marine engine systems. This main jet regulates the fuel flow at higher throttle settings to maintain the correct air-fuel mixture, which is essential for efficient combustion and optimal engine performance. Manufactured to precise factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Fe