Yamaha LF300USB4 Outboard Motor

30-Inch Shaft | Counter Rotation | Digital Electronic Control (DEC) | Electric Start | Power Trim & Tilt | EFI with Variable Camshaft Timing | Classic White

Yamaha LF300USB4 is all about balance, precision, and power. This counter-rotating offshore outboard is made for larger boats and multi-engine setups that demand control and confidence. Under the hood is Yamaha’s 4.2-liter V6 with Variable Camshaft Timing (VCT) and Electronic Fuel Injection (EFI) — an engine known for its quick throttle response, strong midrange torque, and impressive fuel economy.

The 30-inch shaft gives it the reach needed for deep-transom offshore hulls, keeping the propeller perfectly positioned for efficiency and stability. Its counter-rotation design helps cancel torque when paired with a standard-rotation engine, giving smoother steering and easier handling, especially when docking or maneuvering in tight spaces. Dressed in Classic White, it adds a clean, upscale look to premium offshore boats and yachts.

⚠️ Important Installation Note

This outboard features Yamaha’s Digital Electronic Control (DEC) system and must be installed by an authorized Yamaha dealer. Both the motor and the control system require setup using Yamaha diagnostic tools. DIY installation isn’t supported.

Key Features

• Engine Type: 4.2L V6, DOHC with Variable Camshaft Timing (VCT)
• Horsepower: 300 HP
• Fuel System: Electronic Fuel Injection (EFI)
• Controls: Digital Electronic Control (DEC)
• Starting System: Electric Start
• Shaft Length: 30 inches
• Rotation: Counter Rotation
• Trim & Tilt: Power Trim & Tilt
• Color: Classic White
• Alternator: High-output for powering onboard electronics
• Weight: Approx. 575 lbs (dry)

Why Boaters Choose the LF300USB4

• Counter-Rotation Advantage – Balances prop torque in twin-engine rigs for steadier tracking and effortless steering.
• Deep-Transom Ready – 30-inch shaft suits larger offshore boats needing proper propeller depth.
• Smooth Digital Control – DEC system delivers instant throttle response and clean, accurate shifting.
• Offshore-Tough Build – Yamaha’s corrosion-resistant alloys and coatings extend engine life in saltwater.
• Classic White Finish – A bright, elegant look that pairs beautifully with luxury offshore designs.

The LF300USB4 is built for boaters who want the perfect mix of strength, balance, and refinement. It’s a serious offshore engine with Yamaha’s hallmark dependability — ideal for twin setups where smooth handling and high torque matter most.

Frequently Asked Questions

Q: What’s the benefit of counter-rotation?

A: It reduces steering effort and balances torque in twin-engine configurations, improving control at both cruising and docking speeds.

Q: Can I install this engine myself?

A: No. DEC engines must be set up by an authorized Yamaha dealer using Yamaha diagnostic tools to ensure proper configuration.

Q: Which boats work best with a 30-inch shaft?

A: Deep-V and offshore fishing boats, as well as multi-engine setups, where a longer shaft keeps the prop at the correct running depth.