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QJ Motor ECU
Flashing

Flash the Bosch ECU in your QJ Motor SRT 700 X, SRT 550 SX, SRK 421 RR, GS 400 RR or Fort: MSE6.0, MSE8.0 and MSE9.0 units.

9Models
9Model years
3ECU families
Find your QJ Motor See pricing
Supported models

Every QJ Motor we can flash

Model years, the ECU inside and the interface it needs. Bench wiring diagrams for every model are in your MotoFlasher account.

Model Years ECU Interface
ATR 160 2024–2025 Bosch MSE8.0 1.5 MB Tactrix OpenPort 2.0CANable
AX 200 S 2025–2025 Bosch MSE8.0 1.5 MB Tactrix OpenPort 2.0CANable
FORT 350 2024–2024 Bosch MSE8.0 1.5 MB Tactrix OpenPort 2.0CANable
FORT 4.0 2025–2025 Bosch MSE8.0 1.5 MB Tactrix OpenPort 2.0CANable
GS 400 RR 2021–2023 Bosch MSE6.0 1.5 MB Tactrix OpenPort 2.0CANable
SRK 421 RR 2026+ BENCH (Read-Write)/OBD(write) Bosch MSE9.0 TC375 · 6 MB Add-on Tactrix OpenPort 2.0CANable
SRT 550 SX 2024–2024 Bosch MSE6.0 1.5 MB Tactrix OpenPort 2.0CANable
SRT 700 X 2024–2025 Bosch MSE6.0 1.5 MB Tactrix OpenPort 2.0CANable
VPS 125 2024–2025 Bosch MSE8.0 1.5 MB Tactrix OpenPort 2.0CANable
Inside the bike

QJ Motor ECU families

Which engine computer each model uses decides how it is read and written. MotoFlasher picks the right protocol for you.

Bosch Included

MSE8.0

1.5 MB

ATR 160, AX 200 S, FORT 350, FORT 4.0, VPS 125

Tactrix OpenPort 2.0CANable
Bosch Included

MSE6.0

1.5 MB

GS 400 RR, SRT 550 SX, SRT 700 X

Tactrix OpenPort 2.0CANable
Bosch Add-on

MSE9.0

TC375 · 6 MB

SRK 421 RR

Tactrix OpenPort 2.0CANable
How it works

Flash your QJ Motor in four steps

  1. 01

    Connect

    Plug your interface into the diagnostic port, or wire the ECU on the bench with the diagram from your account.

  2. 02

    Read & back up

    MotoFlasher identifies the ECU and reads the full flash. Keep that original file: it is your way back.

  3. 03

    Tune

    Edit fuel, ignition, limiters and the other maps in your tuning editor, or load a file from your tuner.

  4. 04

    Write

    MotoFlasher corrects the checksum and writes the file back. Start the bike and ride.

Why flash a QJ Motor ECU?

QJ Motor’s adventure bikes, sport bikes and scooters all run Bosch engine management with factory maps written for emission tests. Flashing the ECU lets you smooth part-throttle fuelling, match the map to an exhaust and set limits for your riding.

QJ Motor ECU families

  • Bosch MSE6.0: the SRT 700 X, SRT 550 SX and GS 400 RR.
  • Bosch MSE8.0: the Fort 350 and Fort 4.0, ATR 160, AX 200 S and VPS 125.
  • Bosch MSE9.0: the 2026 SRK 421 RR, read on the bench and written over OBD.

Flashing a QJ Motor, step by step

  1. Keep the battery on a charger.
  2. Connect a Tactrix OpenPort 2.0 or CANable to the diagnostic connector.
  3. Read the ECU and save the original file.
  4. Edit the maps or load the file from your tuner.
  5. Write it back. MotoFlasher corrects the checksum.

Frequently asked questions

Is the QJ Motor SRT 700 X supported?

Yes, on the Bosch MSE6.0 ECU.

Which interface do I need for a QJ Motor?

A Tactrix OpenPort 2.0 or a CANable.

Can I go back to the stock map?

Yes. MotoFlasher reads the full original file before writing anything, and you can write it back at any time.

More brands

Flashing another brand?

Aprilia 12 models Benelli 6 models BMW 3 models CFMoto 47 models Ducati 12 models GOES 7 models Honda 19 models Italjet 1 model Kawasaki 33 models Kove 13 models KTM 7 models Loncin 2 models Moto Guzzi 5 models Moto Morini 3 models ODES 1 model Piaggio 4 models Segway 5 models Suzuki 17 models Triumph 14 models Voge 20 models Yamaha 17 models Zontes 17 models ZX Moto 1 model

Ready to flash your QJ Motor?

One license, every supported model of the brand, free software updates and support from people who tune bikes.

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