17203-ZY3-000 Flame Trap - Overview. The 17203-ZY3-000 Flame Trap is a crucial safety component within the Honda marine engine systems, designed to prevent flame propagation from engine backfires that could ignite fuel vapors. Installed in the fuel system, this flame trap plays an essential role in maintaining the safe and reliable operation of your Honda outboard motor. Constructed to adhere to strict factory specifications, it ensures seamless integration with existing parts, maintaining optim