Yamaha LF150XD 150HP 25″ Counter-Rotation Outboard

Description

The Yamaha LF150XD pairs a 150HP counter-rotation gearcase with a 25-inch shaft, built for multi-engine offshore boats. The 2.7-liter inline-4 displaces 2670cc and weighs 509 lbs dry. Built for mid-transom configurations, the 25-inch shaft ensures ideal propeller depth and balanced tracking across heavy-duty fiberglass hulls navigating rough open ocean waters.

Running within a 5000-6000 RPM range, this offshore engine sustains cruising speeds across long tournament distances. The 2.00:1 gear ratio converts combustion force into a flat torque curve, so heavy boats get on plane without burying the stern under load. This Japan-built platform is engineered to reduce hull vibration during long-range deep-sea operations.

Technical Specifications of Yamaha LF150XD

• Electronic fuel injection uses multi-point precision management for strong thermal efficiency across all cylinders.
• A 36-Amp gross alternator generates enough power to keep house battery banks topped off.
• Remote mechanical control gives responsive vessel tracking adjustments.
• Power trim and tilt simplifies trailering and shallow-water operation by moving the lower unit clear.
• A 4.5-liter oil sump supports continuous lubrication during hard wide-open-throttle runs.
• The counter-rotation gearcase balances propeller torque to maintain tracking on multi-engine express cruisers.

Twin Balancer Inline Architecture

Twin balancer shafts integrate into this 16-valve DOHC inline-4 to reduce harmonic resonance, cutting vibration off the powerhead while improving heat transfer under offshore load.

Multi Point Precision EFI

Direct fuel induction sprays gasoline into the cylinders under high pressure for clean combustion on 87-octane fuel, giving instant throttle response and crisp acceleration timing ocean rollers.

Shift Dampener Gearcase Profile

Oversized internal gears and a shift dampener system-compatible gearcase minimize underwater drag at cruising speed, mitigating gear chatter and ensuring smooth power transmission.

Mechanical Remote Helm Setup

Mechanical control integrates with the fuel system to extend cruising range automatically, coordinating with the alternator to power critical open-water electronics.

Opposing Twin Engine Match

Opposing twin-engine configurations for offshore sportfishers, deep-V center consoles, and walkarounds in the 22-32 ft range are the target. The mid-length shaft delivers strong leverage and vibration dampening driving through steep waves.

Cowling Access And Lubrication

A multi-piece outer cowling gives fast access to critical checking points, cutting service time down. The drain plug keeps oil changes clean. Pro Tip from the Shop: match this lower unit with a shift dampener system propeller to eliminate clunking and reduce shock on the internal gear train.