This is an OEM Yamaha service lead to test the ABS system on all ABS equipped FJ1200's and FJR1300's from 2003-2012.
This tool is used to test the ABS system both mechanically and electronically as per the Yamaha service manual. This means every 8k on FJ's and  6K on FJR's. Failure to perform this funtion will result in the ABS unit (cost approximately £1500) eventually seizing.
The lead comes with instructions written by the club and a copy from Yamaha workshop manual to allow you to easily perform the operation at home.
It comes with basic servicing use instructions to fully test your bikes ABS.
The Yamaha Workshop manual has even more detailed usage instructions.