This article specifically relates to 2021 Honda CBR650R and CB650R models.  These models cause some confusion when trying to select the correct harness to use to connect the Woolich Racing Communication Interface (Log Box or USB) to the ECU as there are 3 different versions of the 2021 CBR650R/CB650R models.

The information below helps to identify which version you have and then to understand which harness you will need to flash the ECU.

#1. Has the old Honda 4 pin diagnostic plug.
This one can be flashed using the Honda Harness Type 1 (on bike), or the Honda Bench Harness Type 1.
This is usually found on a 2020 model that was sold in 2021.

#2. Has the new small 6 pin red diagnostic plug (Euro5 standard), but still uses the single wire K-Line for communications.

The diagnostic plug has 4 wires (Black/blue, Orange/white, Brown, Green)

This one can be read using the Honda Bench Harness Type 1, OR a Honda On-Bike Harness Type 1 with the Honda Diagnostic Converter Type 1.

The grey ECU plug on this model is wired like this.

#3. Has the new small 6 pin red diagnostic plug (Euro5 standard), but uses a new protocol to talk to the ECU.

The diagnostic plug has 5/6 wires, (Black/blue, Brown, Red, White, Green).

This one can now also be flashed but requires the UNIVERSAL HARNESS TYPE 4 to do it on the bike or Honda Type 12 Bench Harness for off the bike.

The Grey ECU plug on this model is wired like this.