Yamaha 300HP F300XSB DEC Outboard – 25″ Shaft
The 300-horsepower Yamaha F300XSB DEC outboard uses a 25-inch shaft for compatible transoms. Its electronic controls support accurate throttle and shift commands, while the engine’s output provides practical propulsion for offshore cruising, fishing, and utility applications.
Description
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Yamaha 300HP F300XSB DEC Outboard Specs
| Brand | Yamaha Marine |
| Full Model Code / Part Number | F300XSB (DEC / 25" 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 | XL: 25 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) | 255 kg / 562 lbs |
| Standard Warranty | 3 Years Limited Pleasure Boat Warranty |
Common Question of Yamaha F300XSB
Is F300XSB a DEC model?
Yes. The Yamaha F300XSB is identified with DEC Digital Electronic Control and a 25-inch shaft. Confirm the exact fuel system, controls, harnesses, gauges, battery, steering equipment, transom strength, and package contents before installing this high performance outboard motor configuration.
What transom fits its shaft?
A 25-inch transom is the intended match for this F300XSB model. 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 this ready to bolt marine installation.
What should buyers verify?
Verify horsepower suitability, engine weight, transom height, steering hardware, control equipment, battery capacity, wiring, fuel supply, gauges, and package contents. The supplied title does not specify EFI, so confirm technical details through Yamaha documentation before repowering or operating the outboard.
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