Yamaha F350ESA 350HP DEC 35″ Shaft Outboard Motor

Description

The Yamaha F350ESA runs 350HP through a 35-inch ultra-long shaft, built with standard rotation for multi-engine offshore boats. The 4.3-liter 60-degree V6 displaces 4256cc and weighs 653 lbs dry — considerably lighter than the V8-powered 450 series, since this platform runs six cylinders instead of eight. Built for towering deep-V transoms, the 35-inch shaft keeps the propeller properly immersed on heavy-duty fiberglass hulls in rough open water.

Peak output holds through a 5000-6000 RPM band, sustaining cruising speed across long tournament distances. The 1.75:1 gear ratio converts combustion force into a flat torque curve, so heavy boats get on plane without burying the stern under load. This is a Japan-built platform, engineered for stability during long-range offshore operations.

Technical Specifications of Yamaha F350ESA

• Electronic fuel injection optimizes fuel atomization for high thermal efficiency across all cylinders.
• A 70-Amp gross alternator generates enough power to keep house battery banks topped off.
• Integrated electric steering replaces complex hydraulic lines with instant digital response at the wheel.
• TotalTilt simplifies trailering and shallow-water operation by tilting the lower unit completely clear.
• A 6.3-liter oil sump supports continuous lubrication during hard wide-open-throttle runs.
• The standard-rotation lower unit spins clockwise, built for single or primary-engine thrust.

Variable Camshaft Timing

Variable camshaft timing adjusts the intake valves on this 24-valve DOHC V6 to improve thermal efficiency, reducing response lag and improving torque delivery under offshore load.

Electronic Fuel Induction System

Multi-port electronic fuel injection sprays gasoline into the intake tracks for clean combustion on 89-octane fuel. That delivery method keeps throttle response immediate and cold starts reliable in changing early-morning coastal conditions.

Hydrodynamic Gear Housing Profile

Oversized internal gears and a streamlined lower unit maximize hydrodynamic thrust while keeping underwater drag down at high speed. That setup keeps lower-unit chatter down and propeller tracking steady when backing down on a fish.

Integrated Vessel Electronics Control

Digital electronic control integrates with the electric steering system to handle house power needs automatically, coordinating with the charging system to run multifunction displays and gyro stabilizers without draining the batteries.

Offshore Hull Match Application

Mid-to-large offshore center consoles, walkarounds, and express cruisers in the 26-38 ft range are the target application for this 35-inch motor. The ultra-long shaft delivers strong leverage and vibration dampening driving through steep waves.

Cowling Access And Lubrication

A multi-piece outer cowling gives fast access to critical checking points, cutting service time down. The drain plug location keeps oil changes clean rather than messy. Pro Tip from the Shop: connect a freshwater wash hose directly to the upper flushing port after every trip to blast salt crystals out of the cooling jacket without starting the engine.