AMF 170 Pro Sport Repower: Suzuki DF140BTG Stealth Upgrade
Modernising a Proven Hull with New Suzuki Power and Technology
The AMF 170 Pro Sport is a well-regarded New Zealand-built boat known for its solid construction, practical layout and excellent offshore capability. While the hull of this vessel was still in excellent condition, the original 20-year-old Suzuki DF115 outboard was beginning to show its age cosmetically and was ready for an upgrade.
The original Suzuki DF115 had provided many years of reliable service and had performed exceptionally well, but the owner decided it was the right time to refresh the vessel with modern outboard technology and restore the boat to its full potential.
Marine Power Systems completed a complete outboard repower, removing the existing Suzuki DF115 and installing a new Suzuki DF140BTG Stealth outboard package.
The Repower Solution
The upgrade included:
- New Suzuki DF140BTG Stealth outboard engine
- Suzuki electronic fly-by-wire controls
- Suzuki digital SMG4 multifunction display
- Hydraulic steering system upgrade
- Autopilot installation
- Full commissioning and setup
The result was a modern, reliable propulsion package that matched the capability of the AMF hull while adding the latest technology and convenience features.
Why Repower an Older Boat?
This project is a great example of how a well-built older boat can be transformed through a professionally planned repower.
Many quality hulls remain structurally sound and perfectly suited to modern boating long after the original engine has reached the end of its ideal service life.
Instead of replacing the entire vessel, repowering provides an opportunity to:
- Restore reliability
- Improve performance
- Add modern technology
- Increase vessel value
- Extend the life of a proven hull
The AMF 170 Pro Sport is a strong example of this approach. With a solid hull and proven design, upgrading the propulsion system created a boat that feels like new again.
Performance Results
The completed repower transformed the AMF into a reliable and high-performing vessel.
During sea trials, the performance included:
- 16 knots - 9.6L/hr
- 20 knots - 15L/hr
- 24 knots - 20L/hr
- 26 knots - 24L/hr
- 33 knots - 51L/hr
Suzuki DF140BTG Stealth Upgrade
The Suzuki DF140BTG Stealth was selected as the ideal replacement for this application, providing a significant technology upgrade while maintaining the reliability and efficiency Suzuki outboards are known for.
Key benefits include:
- Modern four-stroke efficiency
- Strong mid-range torque
- Quiet operation
- Advanced electronic engine management
- Improved user experience through digital integration
The addition of Suzuki's electronic throttle and shift system provides smoother operation, easier control and improved integration with modern marine electronics.
Upgraded Controls and Electronics
As part of the repower, the opportunity was taken to upgrade the vessel beyond simply replacing the engine.
The installation of Suzuki electronic controls and the digital SMG4 display provides the owner with:
- Clear engine monitoring information
- Improved control and operation
- Modern instrumentation
- Better visibility of engine performance
The hydraulic steering system was also upgraded, ensuring the new engine package delivered the precise handling and reliability expected from a modern outboard installation.
Autopilot Installation for Game Fishing
With the owner regularly using the vessel for game fishing, an autopilot system was installed to improve usability while trolling.
The autopilot assists with maintaining course and reducing workload during long days on the water, allowing the owner to focus on fishing rather than constantly managing steering input.
This upgrade adds significant value for offshore and game fishing applications where precise boat control is essential.
The result
The combination of:
- Proven AMF hull design
- New Suzuki DF140BTG Stealth power
- Electronic controls
- Digital instrumentation
- Upgraded steering
- Autopilot integration
has delivered a vessel that is ready for many more years of reliable boating.
This project demonstrates that with the right advice and a professionally engineered repower, an older but well-built boat can be brought back to life without the need to replace the entire vessel.
Marine Repower Specialists
Marine Power Systems specialises in complete outboard repower solutions, helping boat owners upgrade older vessels with modern engines, controls and marine technology.
From engine selection and installation through to electronics integration and commissioning, our team provides complete solutions tailored to the way each owner uses their boat.
Considering a repower for your vessel?
Contact Marine Power Systems to discuss your options.
Owners Review:
I couldn't fault Rob's service, communication and cooperation.
He made a very tidy job of the repower.
5 Stars