Yamaha LF300UCB 300HP Outboard – 30in Shaft, Counter Rotation, V6

Towering 30-inch multi-engine transoms require the extreme reach of the Yamaha LF300UCB to maintain absolute propeller bite. The naturally aspirated 4.2-liter V6 translates electronic fuel injection data into brutal low-end torque, pushing heavily loaded displacement hulls effortlessly against stiff coastal tides. Verifying your exact twin-engine bracket guarantees this extra long shaft counter rotating outboard aligns securely without starving the internal water pump.

Eliminate dangerous port-side tracking instability permanently by pairing this specialized left-hand gearcase with your primary starboard engine. You pilot massive commercial vessels safely across treacherous coastal inlets while maintaining precise mechanical throttle control. Engineers cast the 263 kg ultra-long lower unit using specialized anti-corrosion marine aluminum alloys. This structural barrier stops galvanic decay completely when repowering large offshore vessels for daily saltwater exposure.

Key Features of Yamaha LF300UCB

- Multi-Point Sequential EFI: Calculates precise fuel requirements continuously, eliminating carburetor hesitation and ensuring crisp throttle response across the 6000 RPM band.
- 30-Inch Ultra-Long Shaft: Reaches incredibly deep beneath towering offshore transoms, preventing water pump starvation in heavy ocean chop.
- Hydraulic Power Trim: Adjusts the running angle dynamically via a console switch, optimizing bow attitude across aggressive offshore swells.
- Remote Mechanical Compatibility: Accepts standard mechanical cables directly from your forward helm, integrating flawlessly with classic steering consoles.
- 50-70 Amp Charging Alternator: Outputs massive charging power, keeping demanding radar systems and heavy-duty livewell pumps fully powered offshore.
- Anti-Corrosion Finish: Blocks severe galvanic decay physically, protecting the aluminum powerhead block across decades of daily saltwater exposure.
- Through-Prop Exhaust: Channels toxic combustion gases directly underwater, keeping the aft operator station completely free of choking smoke.
- Accessible Oil Drain: Simplifies routine crankcase lubrication changes, saving significant time during seasonal maintenance prep without specialized tools.
- Counter-Rotating Gearcase: Cancels the massive lateral thrust of a starboard engine, keeping twin-engine performance hulls tracking perfectly straight underway.
- Clean Four-Stroke Engineering: Eliminates messy two-stroke oil reservoirs, keeping your bilge completely clean while meeting strict clean water standards.

Why Choose Yamaha LF300UCB

Choosing this specific engine limits installation entirely to the port side of 30-inch tall transoms requiring extreme lower unit reach. You cannot mount this on a standard 25-inch bracket without generating massive hydrodynamic drag. Correcting your rigging geometry is a mandatory step when replacing older mechanical outboards.

- Confirm a 30-inch vertical drop from the massive mounting bracket to the keel line.
- Install corresponding mechanical control cables sized exactly for your specific offshore hull length.
- Navigate restricted coastal fisheries legally utilizing advanced four-stroke combustion.

Ideal Application and Vessel Fitment

This 30-inch counter-rotating outboard excels on massive offshore catamarans, heavy aluminum offshore fishing boats, and large commercial vessels carrying heavy payloads. By integrating a proven 4.2-liter displacement block with standard mechanical cable controls, the engine acts as an incredibly reliable mechanical workhorse for commercial boaters. The ultra-long shaft allows captains to operate safely in massive ocean swells, making this extra long shaft 300hp outboard an absolute necessity for commercial offshore operators.

Warranty, Support and Maintenance

Authorized recreational operation receives a 3-Year Pleasure Warranty alongside exceptional factory support. Registered commercial applications fall under a strict 1-Year Commercial Warranty with zero corrosion coverage applied to the block. Scheduled maintenance requires replacing gearcase lubricants and changing oil filters at manual-specified intervals. Always save all physical service records. Your engine serial number acts as the only way to source exact genuine replacement parts. For product details and order support, Mulmotor offers assistance before your purchase is placed.