3 min read
Source: AutoTuner (AT Team) — October 23, 2026
For years, remapping a modern four-stroke enduro or motocross bike meant one thing: pulling the Keihin ECU off the machine, opening the case, and reading the calibration on the bench. That changed this week. AutoTuner has added 100% OBD Normal Read support for the Keihin 812.41 and 796.41 ECUs that run KTM, Husqvarna, Husaberg and GasGas off-road machines, letting tuners read and write the factory software and calibration straight through the bike's diagnostic connector.
What the Keihin 812.41 and 796.41 Protocol Actually Covers
The new AutoTuner protocol targets two generations of Keihin off-road ECUs, each mapped to a distinct model range.
The Keihin 812.41 (KENZ) covers the earlier generation. On the KTM side that means the 2011–2013+ 250/350/450/500 EXC-F, SX-F, XC-F and SMR models plus the Freeride 350. Husqvarna's 2014–2015+ FC 250/350/450, FE 350/450/501 and FS 450 are included, as are the Husaberg FE and FS 250–570 machines built between 2009 and 2013.
The Keihin 796.41 (KRSZ) covers the current generation. That spans KTM's 2017–2024+ 250/350/450/500 EXC-F, SX-F, XW-F and the 450 Rally Replica, plus the Freeride 250 F and RC4 R. Husqvarna's 2017–2024+ FC, FE, FS, FX and FR 450 Rally line is covered, and so is the full 2021–2024+ GasGas off-road range — the EC and MC four-stroke motocross and enduro bikes, the EX cross-country models, and the ES and RX platforms.
Both ECUs use Renesas KT2021 and KT2022 microcontrollers, and AutoTuner's Normal Read pulls both the software and the calibration in a single pass. The read completes in roughly 2 minutes 15 seconds, and a write lands in about 1 minute 15 seconds with checksum correction handled automatically.
Why OBD Read Matters for Dirt-Bike Tuners
Off-road and motocross tuning has long lagged the street-bike world on independent access. Because these Keihin ECUs were bench-only for third-party tools, a tuner doing a mapping session faced a tedious routine: remove the seat and bodywork, unplug the ECU, open the case on the bench to reach the programming pads, read the file, edit the maps, then reassemble everything before testing. Every iteration added labour, and every case opening added risk to the potting, seals and connectors.
OBD Normal Read collapses that loop. The tuner connects through the diagnostic connector, reads the original file, applies the remap, and writes it back — all without removing the ECU. For a workshop that tunes multiple bikes a day, or a race team making between-moto fuel and ignition changes at the track, that is the difference between a quick calibration tweak and a full strip-down.
This is the same playbook that has transformed passenger-car and street-bike ECU work over the past decade, and it is now arriving in the dirt segment. Shops that already carry a chip-tuning setup and a growing ECU catalog can extend that workflow to KTM, Husqvarna and GasGas off-road machines with the same tool they use for everything else.
There is a real market signal here, too. KTM, Husqvarna and GasGas share a single parent group, which means a single protocol unlock opens three marques and more than a decade of model years at once. For an independent tuner, that is unusually efficient coverage — one tool investment, one cable, and a long list of four-stroke off-road bikes that riders are actively modifying for power delivery, traction and elevation changes.
What You Need Before You Start
One hardware requirement matters more than the rest. To connect directly through the diagnostic connector, AutoTuner's protocol needs the KTM M3C / Keihin OBD cable — a six-pin motorcycle diagnostic lead — to be fully operational. This is not an optional accessory; without it the OBD path will not work, and the job falls back to the bench method the new protocol is meant to replace.
For independent shops and mobile tuners building out their off-road capability, the supporting equipment is straightforward: a reliable OBD2 cable and connector for the vehicle side, and current tool software to pull the latest protocol coverage. AutoTuner users should update their software to pick up the new Keihin 812.41 and 796.41 support, and keep the tool's software update service current so follow-on coverage arrives as it ships.
The practical takeaway is simple. If your shop services modern four-stroke off-road bikes — or if riders in your area are asking for remaps on their KTM, Husqvarna or GasGas machines — OBD support for the Keihin 812.41 and 796.41 turns what was a bench-only specialist job into a plug-in session. For the first time, tuners who work the dirt segment get the same direct access street and automotive tuners have relied on for years.
Written by Roberto Vargas, Key Programming & ECU Specialist at vxdas.com
