99101-187-0600 Main (#60) Jet - Overview. The 99101-187-0600 Main (#60) Jet is a critical component in the Honda marine engine fuel system. It supports the carburetor system by regulating fuel flow at higher throttle openings, ensuring efficient combustion and smooth engine operation. This OEM main jet is built to maintain the fuel delivery precision necessary for Honda engines, enhancing reliability and performance. Designed for compatibility with Honda marine and power equipment series, it sea