Yamaha 300HP F300ECB DEC Outboard – 35″ Shaft
The 300-horsepower Yamaha F300ECB DEC outboard uses a 35-inch shaft for compatible high-transom installations. Electronic controls support accurate throttle and shift operation, while the engine output provides substantial propulsion for offshore cruising and fishing.
Description
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Yamaha 300HP F300ECB DEC Outboard Specs
| Brand | Yamaha Marine |
| Full Model Code / Part Number | F300ECB (DEC / 35" 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 | XXXL: 35 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) | 265 kg / 584 lbs |
| Standard Warranty | 3 Years Limited Pleasure Boat Warranty |
Common Question of Yamaha F300ECB DEC
What does F300ECB 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 35-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 35-inch transom is the intended match for this F300ECB model. Measure the hull according to Yamaha’s instructions before mounting because incorrect shaft length can affect cooling-water pickup, gearcase clearance, propeller immersion, steering response, and trim. Correct measurement supports this ready to bolt marine 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 through Yamaha documentation.
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