31141-P64-003 Pulley - Overview. The 31141-P64-003 Pulley is an essential component in Honda marine engine systems. It plays a vital role in supporting the belt drive system, which is responsible for powering various engine accessories such as the alternator and water pump. Designed and manufactured to factory specifications, this genuine Honda pulley ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Precision-engineered pulley that