Yamaha XSR900
- ECU
- B90-8591A-XX
- ECU maker
- —
- Model years
- 2016-2021
- Stock firmware
- Upload your own
What you can tune
167 calibration tables · 0 scalars · 55 patches & flags — all editable in the browser.
Getting started
Upload your own BIN read of this ECU to start from.
Heat-mapped tables, editable 2D/3D graphs, cell math, AI auto-tune, and compare against other reads.
Download a standard modified BIN and flash it with your own hardware and software.
Calibration maps
| Map | Group | Tables |
|---|---|---|
| SAP Pressure Comp | Fuel | 1 |
| ETC vs rpm Idle Speed | Fuel | 1 |
| InJ. Deg | Fuel | 1 |
| MAP vs RPM Cyl # | Fuel | 3 |
| TPS vS RPM - Cyl # | Fuel | 3 |
| TPS-MAP Bias | Fuel | 1 |
| Delta TPS vs RPM Gear N | Fuel | 1 |
| Delta TPS vs RPM Gear 1-2 | Fuel | 1 |
| Delta TPS vs RPM Gear 3-4-5-6 | Fuel | 1 |
| Rev limits Fuel - by Gear | Fuel | 1 |
| Gear Map# - Mode STD | Ignition | 1 |
| Gear Map# - Mode A | Ignition | 1 |
| Gear Map# - Mode B | Ignition | 1 |
| Gear N | Ignition | 1 |
| Map## | Ignition | 9 |
| Ing. Offset Cyl # | Ignition | 2 |
| Volt-Dwell | Ignition | 1 |
| Rev limits Ign | Ignition | 1 |
| Gear vs RPM Mode # - IGN Control P | Ignition | 2 |
| Gear vs RPM Mode # - IGN Control I | Ignition | 2 |
| Gear vs RPM Mode # - IGN Control D | Ignition | 2 |
| Gear-MAP Index# | Throttle / ETV | 1 |
| Gear-MAP Index#' | Throttle / ETV | 1 |
| STD MAP## | Throttle / ETV | 7 |
| STD MAP##' | Throttle / ETV | 7 |
| A MAP## | Throttle / ETV | 7 |
| A MAP##' | Throttle / ETV | 7 |
| B MAP## | Throttle / ETV | 7 |
| B MAP##' | Throttle / ETV | 7 |
| ETV Limits STD # | Throttle / ETV | 1 |
| ETV Limits STD #' | Throttle / ETV | 1 |
| ETV Limits A # | Throttle / ETV | 1 |
| ETV Limits A #' | Throttle / ETV | 1 |
| ETV Limits B # | Throttle / ETV | 1 |
| ETV Limits B #' | Throttle / ETV | 1 |
| STD Gear N | Throttle / ETV | 1 |
| STD Gear # | Throttle / ETV | 6 |
| STD Gear N' | Throttle / ETV | 1 |
| STD Gear #' | Throttle / ETV | 6 |
| A Gear N | Throttle / ETV | 1 |
65 map groups in total — the full list is in the editor.
55 patches & flags (toggle features on/off)
MotoEditor edits the calibration and exports a standard BIN — reading and flashing the ECU is handled by your own flashing hardware and software.
Frequently asked
What can I tune on the Yamaha XSR900 2016-2021?
This verified definition exposes 167 calibration tables — including fuel, ignition, throttle, gearbox, other · ecu modules qs, other · tcs mapping mode maps mode 1, other · tcs mapping mode maps mode 2, other · tcs mapping wheel speed corrections and temperature maps — plus 0 adjustable scalars and 55 feature patches, all editable in your browser.
Do I need to remove or open the ECU?
No. MotoEditor edits the calibration and exports a standard BIN. Reading the stock file from the bike and writing it back is done with your own flashing hardware and software.
Which ECU does this Yamaha XSR900 definition cover?
The B90-8591A-XX. Every map address and scaling is verified against the stock firmware, so what you edit matches the real calibration.
Can I use my own stock file?
Yes. Start a project from your bike's stock BIN and your changes apply to it, or begin from the built-in reference — either way you export a standard BIN.
How much does access cost?
MotoEditor is a single subscription that unlocks the browser editor for this definition and every other bike in the library — no per-project or per-download fees.