Yamaha F250 Offshore 4.2L Nizpro 315 ECO ECU Tune (A Series 2014–2021)

Unlock stronger everyday drivability and improved cruising efficiency from your Yamaha F250 Offshore 4.2L with the Nizpro 315 ECO calibration, designed to improve throttle response, mid-range performance, and overall efficiency while maintaining safe operation on 87 octane.

This calibration is ideal for owners who want their F250 to feel stronger and more responsive across the RPM range without stepping up to a more aggressive premium-fuel tune. The biggest gains are where most offshore boaters actually use the engine: getting on plane, carrying load efficiently, and holding speed with less effort.

Performance Data
Stock Output: 250 HP
Tuned Output: 315 HP
Power Increase: +65 HP (+26.0%)
Tune Type: 315 ECO
RPM Limiter: 6500 RPM
Minimum Fuel Required: 87 Octane

What this tune improves

The Nizpro 315 ECO calibration is built to deliver stronger real-world performance with an efficiency-focused calibration strategy.

Real-world improvements include:

• Faster hole shot and reduced time to plane
• Stronger mid-range pull under load
• Sharper throttle response
• Improved cruising efficiency
• Better overall drivability for offshore use

This means the engine feels more responsive, more usable under load, and more efficient in everyday operation.

Compatible Engines

This product is for Yamaha F250 Offshore 4.2L A Series applications from 2014–2021.

ECU Compatibility

• 6CG-04, 6CG-20, 6CG-21, 6CG-22, 6CG-23, 6HD-00

Select your ECU part number using the abridged format shown above.

If you do not see your ECU listed, select Not Listed / Unsure. We will verify compatibility before flashing.

How to order

• Select your Service Type
• Select your ECU Part Number (Abridged)
• Complete checkout
• If you selected mail-in service, ship your ECU using the instructions provided after purchase
• We flash and return it quickly so you can get back on the water

Service Options

Mail-In ECU Service
For customers anywhere in the U.S. Remove your ECU, ship it to us, and we will flash and return it.

Local Mobile Flash Service (Florida)
We will pull your ECU for you and flash it on site. Available for qualifying local appointments within 40 miles of Ormond Beach, FL.

Important before ordering

Please verify your engine model and ECU part number before purchasing. Every order is reviewed to ensure correct ECU compatibility before flashing.

Notes
Performance results can vary based on hull, prop, load, fuel quality, and operating conditions.