Yamaha 300HP F300USB DEC Outboard – 30″ Shaft
With 300 horsepower, DEC controls, and a 30-inch shaft, the Yamaha F300USB supports compatible offshore transoms. Electronic operation provides precise throttle and shift control, while the shaft length helps maintain propeller alignment and effective propulsion.
Description
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Yamaha 300HP F300USB DEC Outboard Specs
| Brand | Yamaha Marine |
| Full Model Code / Part Number | F300USB (DEC / 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 (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 F300USB
What shaft length does it use?
The Yamaha F300USB uses a 30-inch shaft, intended for a matching tall transom. Measure the boat according to Yamaha’s instructions before mounting because incorrect shaft length can affect cooling-water pickup, gearcase depth, propeller immersion, steering response, and trim. Correct measurement supports this ready to bolt marine installation.
Is F300USB a DEC model?
Yes. The product title identifies F300USB as a DEC outboard. Digital Electronic Control requires compatible controls, harnesses, gauges, battery capacity, steering equipment, and correct rigging. Confirm the exact fuel system and package contents before installation of this high performance outboard motor on a suitable boat.
What should buyers verify?
Verify horsepower suitability, engine weight, transom strength, steering hardware, controls, battery capacity, wiring, fuel supply, gauges, shaft length, and package contents. A 30-inch shaft does not guarantee universal fitment. Follow Yamaha installation documentation before repowering or operating the outboard.
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