99104-MAZ-0380 Slow (#38) Jet - Overview. The 99104-MAZ-0380 Slow (#38) Jet is a vital component in Honda marine engine systems, specifically aiding the carburetor's fuel-air mixture control at idle and low speeds. This slow jet plays a critical role in maintaining engine stability during idle, ensuring smooth operation and reliable performance. Designed to integrate seamlessly with Honda's marine engine systems, it ensures optimal fuel delivery and efficient combustion, supporting consistent en