HARLEY DAVIDSON · MT21M ECU

HARLEY DAVIDSON SPORTSTER MT21M tuning files

Everything we work with on the HARLEY DAVIDSON SPORTSTER fitted with the MT21M. The matched variants sit between 90 and 122 HP from the factory. 5 distinct variants are catalogued here. Stage 1 and Stage 2 are the safe starting points for this platform. Your file is built against the exact ECU software on the car, then operator-verified.

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Available solutions

Solutions that apply to the MT21M on this vehicle platform. The exact set depends on the specific engine and software version.

Stage 1 Stage 2

Engine variants & ECU software

5 distinct variants for the HARLEY DAVIDSON SPORTSTER on the MT21M ECU. Reference the engine and controller software when you upload.

Variant 1

ECU

Catalog engine: 1200 122HP
Controller brand: DELPHI
ECU: MT21M
Stock power: 122 HP
SW upgrade: 41001139C
Calibration: 41001139C

Variant 2

ECU

Catalog engine: 1200 122HP
Controller brand: DELPHI
ECU: MT21M
Stock power: 122 HP
SW upgrade: DPL00000c
Calibration: DPL00000c

Variant 3

ECU

Catalog engine: 1250 120HP
Controller brand: DELPHI
ECU: MT21M
Stock power: 120 HP
SW upgrade: 41001139F
Calibration: 41001139F

Variant 4

ECU

Catalog engine: 1250 120HP
Controller brand: DELPHI
ECU: MT21M
Stock power: 120 HP
ECU SW: 41001214
ECU HW: 41000713
SW upgrade: 41001139F
Calibration: 41001139F

Variant 5

ECU

Catalog engine: 975 90HP
Controller brand: DELPHI
ECU: MT21M
Stock power: 90 HP
SW upgrade: 41001181C
Calibration: 41001181C

Related vehicles

Other vehicles built on the MT21M controller or the same engine — handy when a platform spans several models and makes.

Questions, answered.

Which tuning solutions are available for the HARLEY DAVIDSON SPORTSTER on the MT21M?

Stage 1, Stage 2. The exact set depends on the specific engine and software version.

Do you cover the MT21M ECU software on this model?

Yes — the HARLEY DAVIDSON SPORTSTER on the MT21M ECU is part of the catalog. Upload your original file and it is matched to the right calibration before any work is done.

How is the file delivered?

Through the TuningBay workflow with operator validation and one safe, sensible result per job. Files we deliver, we stand behind.