90017-P8a-A01 Special (8x29) Bolt - Overview. The 90017-P8A-A01 Special (8X29) Bolt is a precision-engineered fastener for Honda marine engine systems. This special bolt plays a vital role in securing timing belt covers and related components, ensuring they operate reliably under marine conditions. Crafted to fit perfectly within Honda's rigorous specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Specially designed