Flexball Electronic Throttle Controls offers the latest electronic technology to control marine engines and gearboxes. Extremely responsive and reliable, the Flexball system is an alternative and perfect replacement to the more traditional morse cable or hynautic control systems. The Flexball 4500-EM21 is a system suitable for controlling 2x Electronic Engine and 2x Mechanical Gearbox. It connects via CANBus to 1x Flexball 4500 Single Throttle Station.

The Flexball Electronic Throttle Control has the ability to connect to all makes and models of engines either using 0.5-4.5V signals or specific signals suitable for individual engines. Custom solutions can be offered, so contact THT with your exact engine and we can offer a tailored solution. This system is capable to manage all electronic engines from manufacturers including FPT (Fiat Powertrain Technology) Iveco, Caterpillar, Cummins, Volvo, Scania, Yanmar, MAN, MTU, Detroit and others.

Gearbox control is managed through a mechanical actuator on the side of the Actuator box, where a short mechanical morse cable is connected which then connects to the actuator on the gearbox (Note: Morse Cable not included in package)

The Flexball 4500-EM21 offers extremely smooth feel and operates providing extreme precision control all the way through the rpm range from idle to full throttle. The feel the the Flexball throttle is much more refined than any hynautics or morse cable system and is a lot more responsive to small adjustments.

The 4500-ME21 system is multivolt 9-32V. The actuator box is mounted within the engine room and connects electronically using fly by wire to the engine throttle and mechanically to the gearbox actuator.

A great function for twin installations, is Flexball can “sync” the two engines together so only one lever is required to operate both engines when cruising and the engine rpm for both port and starboard engines are perfectly matched.

Extremely easy to install and calibrate. Flexball Electronic Throttle Controls can easily be retro fitted to any existing marine engine in any vessel.

The 4500-EM21 kit includes all components required for connection, except for the morse cable required to connect between the actuator box and the gearbox selector, which we advise be custom made to specific length for the vessel.

$9,218 (includes GST)


  • System can be increased up to 4x throttle stations
  • Trim Switch and Wiring – Suitable to control trim tabs or sterndrive trim.
  • Trolling Valve
  • Remote Docking Control

“Photos for illustration purposes only”

You can purchase this Flexball Throttle Control system here.

  • Key Features
  • INCLUDED IN 4500-EM21 Kit
  • 2x Actuator Box - 9-32V
  • 1x 4500 Single Lever Throttle
  • 1x T-splitter
  • 2x Actuator Box Supply Plug
  • 1x 3m Data Transmission Cable
  • 1x 10m CANBus Extension Harness
  • 2x 5m Engine Throttle Harness
  • 1x Instalaltion Manual
  • Available Ratings More info
  • 2x Electronic Engine and 2x Mechanical Gearbox
  • Pleasure or Commercial Duty
  • Suitable for all makes & models of engine and gearbox