2027 Yamaha Four Stroke Jet Drive F115JB

Meet the 2027 Yamaha F115JB Jet Drive Fourstroke—a purpose-built outboard for boaters who want shallow-water capability without giving up the confident feel of a modern, mid-range four-cylinder. Finished in Yamaha Gray, it looks as clean and serious as the job it’s designed to do: pushing jet-drive rigs with smooth, usable power.
At the heart of this engine is a 1.8L inline-4, DOHC, 16-valve four-stroke that makes 115 bhp (85.8 kW) at 5800 RPM. That powerband pairs naturally with the kinds of hulls that love a jet setup—think lighter to mid-weight river and bay hulls where strong midrange pull and predictable throttle response matter more than headline numbers. And because this is a Jet Drive application, Yamaha rates the pump output at 80 bhp (59.7 kW)—exactly the kind of real-world thrust that helps jet boats hop on plane and stay responsive when conditions change.
Fueling is fuel injected, so cold starts and throttle transitions feel crisp, and it runs on regular gas—a practical win for long days of exploring. With water (open loop) cooling, it’s built for real on-the-water use, and it’s explicitly salt water capable, making it a solid fit whether your weekends live upriver, in the marsh, or out on the coastal backwaters.
Rigging-friendly details help this engine integrate cleanly into a proper build: electric start, a 35-amp alternator to support onboard electrical needs, power trim, and remote steering control. The 25-inch shaft keeps fitment straightforward for compatible transoms, and the dry weight comes in at 378 lbs (171 kg)—a manageable package for the performance you’re getting.
Confidence is also built in. Yamaha’s visual/audible engine alert system and emergency RPM reduction are there to help protect your investment when surprises happen.
This listing is for the engine only—a standout choice if you’re repowering a jet-drive rig or building a shallow-water machine around Yamaha’s proven four-stroke platform.

Color Options

Pricing

Engine

Drive Line

Steering

Meet the 2027 Yamaha F115JB Jet Drive Fourstroke—a purpose-built outboard for boaters who want shallow-water capability without giving up the confident feel of a modern, mid-range four-cylinder. Finished in Yamaha Gray, it looks as clean and serious as the job it’s designed to do: pushing jet-drive rigs with smooth, usable power.
At the heart of this engine is a 1.8L inline-4, DOHC, 16-valve four-stroke that makes 115 bhp (85.8 kW) at 5800 RPM. That powerband pairs naturally with the kinds of hulls that love a jet setup—think lighter to mid-weight river and bay hulls where strong midrange pull and predictable throttle response matter more than headline numbers. And because this is a Jet Drive application, Yamaha rates the pump output at 80 bhp (59.7 kW)—exactly the kind of real-world thrust that helps jet boats hop on plane and stay responsive when conditions change.
Fueling is fuel injected, so cold starts and throttle transitions feel crisp, and it runs on regular gas—a practical win for long days of exploring. With water (open loop) cooling, it’s built for real on-the-water use, and it’s explicitly salt water capable, making it a solid fit whether your weekends live upriver, in the marsh, or out on the coastal backwaters.
Rigging-friendly details help this engine integrate cleanly into a proper build: electric start, a 35-amp alternator to support onboard electrical needs, power trim, and remote steering control. The 25-inch shaft keeps fitment straightforward for compatible transoms, and the dry weight comes in at 378 lbs (171 kg)—a manageable package for the performance you’re getting.
Confidence is also built in. Yamaha’s visual/audible engine alert system and emergency RPM reduction are there to help protect your investment when surprises happen.
This listing is for the engine only—a standout choice if you’re repowering a jet-drive rig or building a shallow-water machine around Yamaha’s proven four-stroke platform.

Color Options

Pricing

Engine

Drive Line

Steering