Mercury 40EPT 40HP – EFI 15″ Shaft Remote Mechanical

Mercury 40EPT 40HP EFI Short Shaft

The Mercury 40EPT is a high-performance 40HP FourStroke outboard engineered for aggressive acceleration and digital precision in the US recreational marine market. Boasting a compact 747cc inline 3-cylinder SOHC architecture and a dry weight of 204 lbs, this engine provides an exceptional power-to-weight ratio for small fiberglass consoles and performance skiffs. This 15-inch short shaft model is configured with an electric start remote control and Power Trim & Tilt, making it the premier choice for shallow-water estuaries. Our dependable marine outboard engines deliver the mechanical integrity and EFI efficiency needed for reliable high-speed maritime operation.

Operational peak performance for the Mercury 40HP occurs between 5500 and 6000 RPM, supported by a robust 18 Amp alternator. The 2.00:1 gear ratio is strategically tuned to translate the 3-cylinder torque curve into blistering hole-shot acceleration and steady hull planing. Manufactured in the USA, this highly corrosion-resistant marine engine incorporates Electronic Fuel Injection (EFI) to ensure a quiet, hyper-responsive ride across choppy American coastal waters and inland lakes.

Technical Specifications of Mercury 40EPT

• The 747cc inline three-cylinder SOHC architecture delivers smooth, reliable torque and rapid acceleration in a compact package.
• Advanced Electronic Fuel Injection (EFI) ensures reliable zero-choke starting and improved fuel economy across the entire power band.
• 15-inch short shaft design is purposefully engineered for low-transom vessels and high-speed shallow water performance.
• Power Trim & Tilt system allows the operator to precisely adjust the engine angle from the helm for optimal boat speed and handling.
• Remote mechanical steering compatibility offers a professional helm experience for small center console boats and skiffs.
• SmartCraft compatibility allows for seamless engine data integration with modern digital helm displays and NMEA 2000 networks.

Inline 3-Cylinder 747cc Efficiency

The 747cc 3-cylinder platform maximizes combustion efficiency and eliminates the vibration common in smaller engines. This proven design provides the smooth, reliable mid-range grunt required to push performance skiffs and aluminum fishing boats through harbor currents without the bulk of a larger 4-cylinder engine block.

Advanced EFI Technology

Mercury’s advanced EFI system continuously monitors atmospheric variables to deliver the perfect fuel ratio. This guarantees instant, zero-choke starting and prevents engine bogging during rapid acceleration scenarios, completely eliminating carburetor-related maintenance issues common in mid-range outboards in the American saltwater environment.

Short Shaft Performance

The 15-inch shaft ensures the propeller operates at the optimal depth for maximum hydrodynamic grip on low-transom vessels. This specialized design minimizes drag and prevents cavitation, making it the superior choice for high-speed performance skiffs and aluminum bay boats navigating through unpredictable coastal chop.

Mercury 3-Year Protection

Every Mercury 40HP FourStroke outboard is backed by a comprehensive 3-Year Limited Warranty for American boat owners. This factory-backed coverage covers structural and mechanical defects to ensure long-term maritime reliability and access to genuine parts through a vast nationwide dealer network.

Maintenance & Longevity

Maintaining clean oil in the 3.0L wet sump lubrication system is vital for preserving the engine’s tight mechanical tolerances. Always flush the cooling system with fresh water after every saltwater outing. Pro Tip from the Shop: For performance skiffs running in shallow water, always check the water intake screens for sand or mud after a run, and use a high-quality marine fuel stabilizer to protect the high-pressure EFI injectors during storage.