Yamaha 300HP LF300USB DEC Counter Rotation Outboard – 30″ Shaft
The 300-horsepower Yamaha LF300USB provides DEC counter-rotation operation with a 30-inch shaft. Its electronic controls support precise throttle and shift commands, while counter-rotation helps balance twin-engine thrust and the shaft length suits compatible transom heights for offshore cruising and fishing.
Description
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Yamaha 300HP LF300USB DEC Counter Rotation Outboard Specs
| Brand | Yamaha Marine |
| Full Model Code / Part Number | LF300USB (Counter Rotation / 30" Shaft) |
| Country of Origin | Japan / USA |
| Engine Type & Configuration | 4-Stroke V6 (DOHC 24-Valve with VCT) |
| Horsepower Output (HP / kW) | 300 HP (221 kW) |
| Displacement (cc / cu in) | 4169 cc (254 cu in) |
| Bore x Stroke (mm / in) | 96.0 x 96.0 mm (3.78 x 3.78 in) |
| Maximum RPM Range (Full Throttle Operating Range) | 5000 - 6000 RPM |
| Fuel Induction System | Electronic Fuel Injection (EFI) - V6 VST |
| Ignition System | TCI Microcomputer |
| Starting System | Electric Start (Digital Electronic Control) |
| Steering System | Integrated Digital Electronic Steering (DES) / DEC |
| Trim & Tilt System | Power Trim & Tilt |
| Gear Ratio & Shift Mechanism | 1.75:1 (Counter Rotation Forward - Neutral - Reverse) |
| Exhaust System | Through Prop Hub |
| Recommended Transom Shaft Length | XXL: 30 inches |
| Alternator / Charging Output (Amps / Watts) | 70 Amp (Maximum) / 840 Watts |
| Recommended Fuel Grade & Oil Type | Regular Unleaded (Min. 89 Octane Recommended) / Yamalube 4M FC-W 10W-30 |
| Dry Weight (kg / lbs) | 257 kg / 567 lbs |
| Standard Warranty | 3 Years Limited Pleasure Boat Warranty |
Common Question of Yamaha LF300USB
What shaft length does it use?
The Yamaha LF300USB uses a 30-inch shaft, intended for a matching tall transom. Measure the hull according to Yamaha’s instructions before mounting because incorrect shaft length can affect cooling-water pickup, gearcase depth, propeller immersion, steering response, and paired-engine balance. Correct measurement supports this ready to bolt marine installation.
Is LF300USB counter rotating?
Yes. The LF300USB is identified as a counter-rotation 300-horsepower Yamaha outboard with DEC equipment. Its counter rotating lower unit is intended for compatible paired-engine applications. Confirm propeller specification, engine pairing, controls, steering, battery, wiring, and boat compatibility before installing this high performance outboard motor.
What should buyers verify?
Verify the exact fuel system, control harnesses, gauges, battery requirements, steering equipment, propeller specification, engine weight, transom strength, and package contents. The supplied title does not explicitly state EFI, so confirm technical details through Yamaha documentation before installation.
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