Precise replacement starter for 40-PS (40 HP) boat engines — direct-fit compatibility and dependable marine performance Key benefits Exact fit for 40-PS models: engineered to match the mounting, electrical connections, and performance requirements of 40 HP marine engines for a straightforward replacement. Replaces these part numbers for easy identification: 66T-81840, 40XWT, 40XWH, E40X, and E40XMH. Restores starter functionality and improves engine reliability: built to return consistent starting power, reducing no-start incidents and downtime. Built for marine use: designed for reliable operation across a range of marine environments, offering long service life under normal boating conditions. Quick, low-effort installation: lightweight design and direct-fit form factor allow a fast swap without specialized tools or extended workshop time. Lightweight construction benefits overall performance: reduces starter mass to help preserve balance and contributes marginally to overall engine efficiency. Function and attributes Function: Starter motor replacement to engage and start 40-PS marine engines. Compatibility: Specifically compatible with 40-PS models and intended as a replacement for the listed part numbers (66T-81840, 40XWT, 40XWH, E40X, E40XMH). Confirm model/year fit before purchase. Construction: Engineered for durability and repeated use in marine conditions while remaining lightweight to aid installation and performance. Performance: Reliable cranking and consistent engagement to improve starting success and reduce maintenance intervals. Practical use scenarios Weekend recreational boater: Replace a failing starter quickly before a weekend trip to restore dependable starting without a long service delay. Small commercial or workboat: Minimize downtime for fishing or service vessels by installing a direct-fit replacement that restores consistent starting reliability. Routine maintenance or upgrade: Swap an aged starter during scheduled maintenance to reduce the chance of unexpected no-starts and to keep the engine dependable. What to check before ordering Verify your engine is a 40-PS (40 HP) model and confirm compatibility with the part numbers 66T-81840, 40XWT, 40XWH, E40X, or E40XMH. Inspect mounting points and electrical connectors to ensure a direct replacement for a smooth installation. This starter provides a precise-fit, durable, and easy-to-install solution to restore starting performance on compatible 40-PS marine engines.