Yamaha outboard Four Stroke
Power
25 HP / 19 kW
Version
F25 432cc 25hp
Live ECU tuning for the Yamaha outboard Four Stroke, with measured power and torque gains, a dyno preview, and the supported file options grouped into one focused page.
| Stock | Tuned | Gain | |
|---|---|---|---|
| Power (HP) | 25 | 30 | +5 (+20%) |
Available tuning options
Performance 3
Marine Tune commercial engine
Outboard tune 175 hp and under
Outboard tune 176 hp and over
Services, files & hardware 1
Send us your ECU Includes standard bench fee processing for 1 ECU and NZ return freight. Include a send in ECU form fully filled out with your ECU.
Dyno chart
Original HP
Tuned HP
Original Torque
Tuned Torque
Original HP
Tuned HP
* This chart should be considered a visual representation only, actual values will vary.
Installation and process
Choose the tuning package that fits your goals, confirm the vehicle and ECU, and request your files. AltTune then guides the read, write, and verification steps for your selected vehicle — whether handled remotely with a supported flash tool or on the bench.
Support, safety, and trust
Vehicle condition, maintenance history, fuel quality, and intended use all affect results. We only publish gains we can support for the listed configuration, and we ask that you confirm suitability for your vehicle and application before ordering.
Frequently asked questions
01
Is the Yamaha outboard Four Stroke supported?
This page is generated for an active vehicle in the AltTune catalogue, so it represents a currently supported tuning entry. If your exact ECU differs, contact us to confirm before ordering.
02
What options are available for this vehicle?
The resolved options for this vehicle include Send us your ECU, Marine Tune commercial engine, Outboard tune 175 hp and under, Outboard tune 176 hp and over. The exact list depends on the vehicle type, fuel, and supported protocols.
03
What gains can I expect?
This vehicle shows gains of up to +5 HP and +0 Nm over the factory figures. Real-world results vary with condition and fuel.
