Woolich Racing has offered Race Tools packages for Kawasaki models for many years and there are currently more than 10 different Race Tools packages which have been customised for specific models. The Race Tools kits typically include a Quickshifter or Quickshifter/Autoblipper and a harness which connects the sensor to the bike.
In recent years Kawasaki has made changes to some of their bikes, moving from a single O2 sensor in the exhaust to having two O2 sensors, one in front of- and one behind the catalytic converter. This has been observed on several Kawasaki models with Denso ECUs, such as Z400, Z650, Z900, Z900RS as well as the complete Ninja range typically using the Kawasaki Race Tools Type 9, 11, and 12. This change has required us to modify our Race Tools for these models, this article explains how to select the correct Race Tools kit and for your Kawasaki model.
The Race Tools harnesses provide 12V and ground to power the sensor, and the signal generated by the sensor is connected back to the ECU by using either the exhaust servo or oxygen (O2) sensor, depending on the model.
The 2021 Z400 has a single oxygen sensor and uses a Kawasaki Race Tools Type 11 which connects to the oxygen sensor plug as shown below.
Rear view of O2 Sensor Plug for Kawasaki Race Tools 11 (note that locking tab is on the top)
Recent models of Z400 (eg. 2023) are equipped with two oxygen sensors which have different wiring compared with previous models, and so require a different harness in order to connect the O2 sensor plug. These newer models have one O2 sensor located in front of the catalytic converter and another located behind it. The Race Tools harness for these models with two O2 sensors connects to the front O2 sensor and the plug wiring is shown below.
Rear view of Kawasaki Race Tools 12 O2 Sensor Plug (note that locking tab is on top)
The connection of the Race Tools harness O2 plug to the bike O2 plug is shown below:
Rear view of Bike O2 Sensor Plug for Kawasaki Race Tools 12 (note that locking tab is on the top)
The location of the green wire on the Race Tools plug should correspond with the blue/yellow wire on the bike, and the red wire should correspond with the brown/white wire.