90206-ML7-000 Tappet Adj Nut - Overview. The 90206-ML7-000 Tappet Adj Nut is an essential component within Honda marine engine systems designed specifically for the valve train. This secure fastening nut ensures the tappet remains correctly positioned during valve clearance adjustments, maintaining precise engine timing and mechanical reliability. Manufactured to match Honda's exact factory specifications, it offers seamless compatibility and durability in marine environments, supporting the ove