Yamaha Outboard – LF300ECB

35-Inch Shaft | Counter Rotation | DEC (Digital Electronic Control) | Electric Start | Power Trim & Tilt | EFI with VCT | Gray

The Yamaha LF300ECB is built for offshore boats that need extra propeller depth, strong mid-range power, and confident handling in rough water. With its 35-inch shaft, this model is aimed at tall-transom offshore hulls where keeping the prop in clean water makes all the difference. The counter-rotation setup helps balance steering torque when running twins or triples, giving the operator smoother handling at all speeds.

This engine uses Yamaha’s 4.2-liter V6 with Variable Camshaft Timing and EFI, a combination known for quick throttle response, clean acceleration, and good fuel economy for a motor in this class. The Gray finish gives it a clean, factory look and is built to stand up to long-term saltwater use.

⚠️ Important: This is a Digital Electronic Control (DEC) engine. Installation and setup must be performed by an authorized Yamaha dealer. The engine and control system require flashing and programming with Yamaha diagnostic tools. DIY installation is not supported.

Key Features:

  • Engine Type: 4.2L V6, DOHC with Variable Camshaft Timing
  • Horsepower: 300 HP
  • Fuel System: Electronic Fuel Injection (EFI)
  • Controls: Digital Electronic Control (DEC)
  • Start Type: Electric Start
  • Shaft Length: 35″
  • Rotation: Counter Rotation
  • Trim & Tilt: Power Trim & Tilt
  • Color: Gray
  • Alternator: High-output for powering multiple marine electronics
  • Weight: Approx. 562 lbs (dry)

Why Choose the Yamaha LF300ECB?

  • Extra-Long 35″ Shaft – Keeps the propeller planted in deep or choppy water
  • Counter-Rotation – Reduces steering torque in multi-engine rigs
  • DEC Precision – Smooth, responsive throttle and shifting
  • Durable Gray Finish – Built for offshore corrosion resistance
  • Long-Term Reliability – Yamaha’s 4.2L platform is known for durability

Need help choosing your engine? Check out our Yamaha engine guide.

Frequently Asked Questions

Q: Why would I choose a 35-inch shaft?
A: It’s meant for boats with higher transoms or offshore conditions where the prop needs to stay fully submerged.

Q: Does this work with standard rigging?
A: It requires Yamaha DEC rigging components, which are sold separately.

Q: Can I install this engine myself?
A: No. It must be installed and programmed by a certified Yamaha dealer using Yamaha diagnostic equipment.