Yamaha Releases New 350 Horsepower Outboard

Yamaha added displacement and a host of novel tech to their customer favorite V6 to produce more power in a lighter package.
Yamaha 350 V6 engine
Yamaha’s new 350 hp outboard is powered by a V6 powerhead, which helps keep weight down. Courtesy Yamaha

Yamaha has released a new 350-hp outboard that promises big power in a lightweight container. To get even more ponies out of the company’s popular V6 block, Yamaha engineers harnessed a variety of technologies that make the new powerplant more powerful, efficient, and easy to use.

The F350 has a slightly longer stroke than the F300, squeezing 4.3 liters of displacement out of the block. Yamaha designed a new camshaft to get the extra travel out of the pistons, which provides more torque at lower speeds. One takeaway here is greater hole shot potential. Despite the added power, the compression ratio is 11:1 which should allow the motor live a long life.

Larger intake and exhaust valves contribute to the added power, letting the motor breath more freely. Yamaha says the intake manifolds offer 40 percent larger surge tanks than the F300, and the electronic throttle valve is 8 percent larger, which enhances airflow through the motor. Iridium spark plugs were utilized for more efficient spark, adding to the power equation. New fuel injection control mapping, which produces a longer injector duration than the F300, completes the air + fuel + spark equation and results in more power.

Yamaha 350 illustration
Yamaha’s latest 350 hp outboard engine boasts a valve train that leverages numerous technological advancements. Courtesy Yamaha

Yamaha’s sleeveless, plasma-fused cylinder technology reduces friction and enhances heat distribution. Oil cooler capacity was increased from the F300 to keep everything running smoothly. To protect the outboard, Yamaha incorporated the same water sensor found on the XTO 450 for overheat control.

A redesigned cowling includes an air duct designed to drain any water that might make its way in. Plus, the new cowling exhaust port, combined with a new stator fan, keeps everything under the hood cool. Speaking of stators, Yamaha says the electrical power output on the F350 is also enhanced. This should allow anglers to recharge batteries even at lower RPMs, so accessories and trolling motors should stay strong all day long.

Added power was necessary in the lower unit, so Yamaha came up with a beefier model that can handle the added torque. Despite the stronger internals, they were able to keep the exterior dimensions the same as others in the company’s line. Of note is the new Thrust Enhancing Reverse Exhaust that provides more response when backing down. In this system, the exhaust is directed away from the prop to provide clean water so the blades get more bite.

Control of the motor is effortless, thanks to Yamaha’s Digital Electric Steering (DES). Used in concert with Helm Master EX boat control system, the F350’s DES provides cleaner rigging and more room in the bilge, according to Yamaha. The F350 also incorporates the same TotalTilt technology used throughout Helm Master EX capable DEC outboards.

Grady-White with Yamaha 350s
The lighter weight of the F350 will benefit both single- and multiple-engine configurations. Courtesy Grady-White

The F350 is available in 25-, 30- and 35-inch shaft lengths. The 25-inch shaft version of the F350 weighs 629 pounds; 642 pounds for the 30-inch; and 653 pounds for the 35-inch model. The bigger gear case uses the same propellers as the F300. The new outboard is offered in Yamaha’s pearlescent white, traditional gray, or the new classic white.

“Boaters asked for it, and we delivered,” said Ben Speciale, president of the Yamaha U.S. Marine Business Unit. “The F350 is the perfect big power, light-weight option for a wide variety of applications.”

The Yamaha F350 will be available in Spring of 2024. To learn more, visit yamahaoutboards.com.