Yamaha T50LB 50HP 20in High Thrust Outboard Motor

Description

Featuring a 2.33:1 high-thrust gear ratio, the Yamaha T50LB High Thrust Outboard Motor delivers exceptional bollard pulling power across 20-inch transoms. This four-cylinder 996cc engine generates 50 continuous brake horsepower at 5,500 RPM for commercial working dories. Electronic multi-point fuel injection balances intake fuel charges to maintain steady thrust while powering heavy displacement work barges.

A precision-cast aluminum cylinder block houses centrifugally cast gray iron liners for structural bore rigidity. Dry engine weight measures 258 lbs on a 20-inch shaft. An internal wet sump holds 2.2 quarts of four-stroke marine lubricant. An internal 17-amp charging alternator supplies power to vessel electronics, while cupronickel sacrificial zinc plugs protect internal water jackets from saltwater corrosion.

Key Features of Yamaha T50LB

Commercial barge captains buy Yamaha T50LB outboard engine platforms to modernize utility craft with clean four-stroke power. The oversized lower unit and high-thrust gear ratio deliver exceptional reverse stopping power and low-speed directional maneuvering.

• Oversized 2.33:1 lower gearcase turns large-diameter propellers to produce high forward and reverse bollard pull
• Dual-thrust exhaust redirection diverts exhaust gases during reverse maneuvers to maintain solid blade bite
• Four-cylinder 996cc displacement block provides smooth low-end torque to plane loaded commercial utility craft
• Standard mechanical remote control connections accept marine push-pull throttle and shift cables
• Multi-point electronic fuel injection meters fuel charges to suppress soot and maximize fuel economy
• High-output 17-amp charging stator maintains battery voltage for navigation lights and electric bilge pumps
• Engine-mounted Yamaha T50LB diagnostic ports link with hand tools for quick sensor verification
• Stainless steel water pump housing resists cavitation erosion from suspended harbor sand particles

Combustion Profile Thermal Thresholds

Internal cooling sensors hold powerhead operating temperatures between 135°F and 150°F during full-load runs. The four-cylinder engine produces 50 brake horsepower, operating up to a 6,000 RPM maximum ceiling. Cruising fuel consumption averages 2.4 GPH at 4,500 RPM, expanding to 4.7 GPH at wide-open throttle. Built-in thermal protection logic protects the cylinder block if seawater cooling pressure drops.

Transom Clearance Bracket Geometry

The 20-inch shaft midsection bolts straight to transoms built according to ABYC small craft standards. Four through-transom stainless steel fasteners secure the mounting bracket firmly to the stern. The power trim bracket provides an operational arc of minus-4 to plus-16 degrees, with full tilt reaching 67 degrees to elevate the lower skeg above bottom silt.

Shift Protocol Operational Limits

Remote binnacle levers shift internal dog clutch gears cleanly when moved with deliberate hand pressure at idle. This outboard engine is not engineered for aerated racing hulls, unprocessed waste pumping, or continuous heavy towline operations. Adhering to preventative servicing intervals ensures prolonged mechanical life under demanding commercial conditions.

• Inspect remote control cable connections and verify cooling stream telltale flow each shift
• Replace crankcase motor oil, lube filter, and primary fuel separator every 100 hours
• Install a fresh rubber cooling water impeller and inspect zinc anodes every 12 months

Factory Warranty Crate Contents

The unit carries Yamaha coverage under a 1-Year commercial or 3-Year recreational limited warranty. The factory shipping crate contains the 20-inch remote high-thrust outboard motor, dual-thrust aluminum propeller, transom mounting hardware, fuel line connector, and official owner manuals.