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ARacer RCmini X Engine Management System ECU will completely replace the OEM ECU on the Honda CBR250/300 Rebel 300 CB300F

This is not a piggyback ECU, the RCmini X completely removes the OEM ECU!

This will eliminate all of the issues that would occur with the OEM ECU, giving you full control of how the engine will run without any worries of random changes that typically occurs with a piggyback ECU.

Adjustments could be made with a smartphone/tablet via Wifi. The RCmini X is 100% plug and play, no wiring is needed!

Monitor all your engine vitals on your phone.

We recommend also purchasing the Aracer AF2 module as well so that AutoTune could be enabled.


ARacer RCmini X is a Complete engine management system that allows you to make all adjustments via wifi to your smart phone/tablet. Pair this up with the correct fuel injector size and you could easily tune your engine to run.


Tuning could be done on a dyno (highly recommended) or safely on a backroad/street using a wideband o2 gauge and sensor with the autotune function.


Optional AF2 option is available and recommended to be used with the RCmini X to have the ECU Auto Tune, SKU: ASG-1023A.


RCmini X ECU

  • Brand-new 4-core MCU, the computing speed is increased by 200%
  • 20x17 (RPM x TPS%) fuel adjustment
  • 20x9 (RPM x TPS%) ignition angle adjustment (pay to open another 2 MAP)
  • Manifold Air Pressure base for inlet air amount calculation
  • Environment temp and Baro compensation available
  • Increase Rev Limit. Pit Limit.
  • Increase almost 10% above power after calibration (depend on engine model)
  • Easy plugin (remove stock ECU and install RC1 ECU without any harness modified)
  • Same connector as stock ECU
  • RCmini 5 ECU meet IP67 specs
  • Support Auto-Tune with aRacer AF2 wideband sensor module
  • Built-in Wi-Fi and 360-degree antenna design (no additional wiring required), the connection signal strength is increased by 20%


Honda CBR250/300 Rebel 300 CB300F


Aracer miniX 250/300 swap

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