December 10, 2025  Harley-Davidson Support

The Engine Gateway update brings improvements to the Suzuki protocol and adds support for the latest-generation Harley-Davidson motorcycles.

Harley-Davidson with Raymarine Axiom

Engine Gateway for marine engines with a digital CAN interface supports more than a dozen different protocols, some of which originated in the automotive market. One of the most popular protocols, J1939, is widely used in trucks and heavy equipment. We also support Hyundai and Volkswagen protocols that were brought into marinized engines from the automotive world.

And now we decided to go one step ahead by adding the protocol for Harley-Davidson motorcycles. Who knows - maybe one day we'll order a luxurious black powerboat lavishly decorated with chrome and leather? In that case, simply add the following line to the configuration file:

       PROTOCOLS=HARLEY

and everything will work.

We recorded a video for you showing a Raymarine Axiom marine display installed on a motorcycle, displaying RPM, oil temperature, engine hours, fuel level and volume in the tank, speed (by water, because we are expecting a boat from them), battery voltage, engaged gear, and engine warnings.

We also installed an NMEA 2000 Wi-Fi Gateway on this motorcycle so the rider can switch the Raymarine Axiom into a large-chart mode and at the same time view engine data on a mobile phone via Web Gauges. After all, if he installs a display slightly larger than ours, he won't be able to see the stock gauges located on the motorcycle's tank.

In this update, we improved Suzuki engine support by adding engine warnings (the oil-change reminder is shown as "Maintenance need", and the remaining warnings are mapped to NMEA 2000 alerts in a more intuitive way).

We also added conversion of Suzuki SMG4 data for fuel-tank level and total fuel used. To make Engine Gateway display the tank capacity defined in the SMG4 settings, set TANK_CAPACITY_x to DEFAULT in the configuration file.

Suzuki 8-pin adapter cable

To connect Engine Gateway to Suzuki engines, we have prepared an adapter cable (see above) priced at USD $39. It can be ordered from our online store together with the Engine Gateway, and will soon be available from our dealers.

Please note that Engine Gateway does not support the K-Line interface. It cannot replace Engine Interface Cables 99C0-88149-xxx, Engine Connect Gateway 99C0-88171, or the SMD Gateway Unit 34923-96L02. It also cannot replace the Suzuki SMG4 if it is configured for the K-Line protocol (SPC 1.0 engines) rather than CAN.

Our product can replace the SMD Gateway 34923-96L13 and the Suzuki SMG4 display (when configured for the CAN protocol). The gateway is compatible with all Suzuki SPC 2.0 engines (2022 and newer).

Firmware update 1.51 for Engine Gateway is available on the Downloads page.

 

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