Yamaha F70LB2 70HP 20″ Mechanical Outboard Motor

Description

The Yamaha F70LB2 runs 70HP through a 20-inch shaft, built with standard rotation for multi-engine offshore boats. The 1.0-liter inline-4 displaces 996cc and weighs 253 lbs dry. Built for shallow sterns, the 20-inch shaft ensures complete propeller immersion on coastal center consoles and skiffs navigating open ocean waters.

Sustaining high-speed cruising across long tournament distances is easy running this powerhead within its 5300-6300 RPM threshold. The 2.33:1 gear ratio translates combustion pressure into a torque curve that lifts wide hulls onto plane rapidly. Built on proven Japanese engineering, this platform provides mechanical consistency for captains operating far beyond standard coastal ranges.

Technical Specifications of Yamaha F70LB2

• Multi-point electronic fuel injection pushes gasoline precisely for complete combustion and clean power delivery.
• A 17-Amp gross alternator handles the electricity demands of modern multi-display helms.
• Remote mechanical steering compatibility removes complex hydraulic links to streamline rigging.
• Power trim and tilt includes a 65-degree maximum tilt path for shallow waters.
• A 2.1-liter oil reservoir keeps components lubricated during long wide-open-throttle runs.
• The standard-rotation lower unit spins clockwise, built for single or primary-engine thrust.

SOHC Sixteen Valve Powerhead

The 16-valve SOHC design treats the cylinder configurations of this inline-4 to optimize thermal efficiency, shaving response lag off the powerhead while accelerating thermal dissipation.

Multi Point EFI Induction System

Electronic fuel injection pushes fuel into each intake track for complete combustion on 87-octane fuel, giving crisp throttle recovery and instant starting.

Hydrodynamic Heavy Duty Gearset

Oversized drive gears housed inside a hydrodynamic lower unit minimize underwater drag during high-speed cruising, dampening gear-shift vibration and maximizing directional tracking.

Mechanical Control Loop

Mechanical steering links connect directly with the transom bracket setup for reliable helm response, coordinating with a stable charging loop to power open-water electronics.

Flats Skiff Integration

Coastal center consoles, flats skiffs, aluminum multi-species fishing boats, and fiberglass runabouts in the 16-22 ft range are a strong match. The shaft prevents propeller ventilation climbing rollers.

Rapid Fluid Servicing Access Point

A multi-piece cowling detaches smoothly for quick dipstick checks, and drainage pathways isolate waste fluids for clean oil changes. Pro Tip from the Shop: connect a freshwater wash hose directly to the upper flushing port after every trip to blast salt crystals out of the cooling jacket without starting the engine.