Yamaha 300HP F300UCB DEC Outboard – 30″ Shaft
With 300 horsepower, DEC controls, and a 30-inch shaft, the Yamaha F300UCB supports compatible high-transom installations. Electronic operation supports responsive commands, while the shaft length helps maintain proper propeller depth and efficient thrust delivery.
Description
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Yamaha 300HP F300UCB DEC Outboard Specs
| Brand | Yamaha Marine |
| Full Model Code / Part Number | F300UCB (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 F300UCB
What does F300UCB DEC mean?
DEC generally refers to Digital Electronic Control, using electronic commands for compatible throttle and shift functions. This Yamaha 300-horsepower outboard uses a 30-inch shaft. Confirm controls, harnesses, gauges, battery capacity, steering, fuel system, transom strength, and package contents before installing this high performance outboard motor.
What transom fits its shaft?
A 30-inch transom is the intended match for this F300UCB configuration. Measure the hull before purchase because incorrect shaft length can affect cooling-water pickup, gearcase depth, propeller immersion, steering response, and trim. Correct measurement supports a properly fitted ready to bolt marine outboard installation.
Does it use fuel injection?
Confirm the exact Yamaha fuel system before making an EFI claim. The supplied title identifies DEC controls but does not explicitly state fuel injection. Verify controls, wiring, battery, steering equipment, fuel supply, gauges, engine weight, and package contents before operation.
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