I've seen many posts asking about how to make the Interface cable for the kawasaki racing ECU, My bike is an 04' zx10, The 5 pins in the the racing harness programming connector are as follows, You'll have to verify your own pins from other years, the kawi racing manuals have the diagrams for the race ECU connection in the back. The Racing ECU comes with the software, FYI...
Orange 5 volt- TTL
Red/white stripe-12 volts
2 x Brown/black stripe-ground
You will need:
1.USB to serial port cable
2. Serial to 5 volt TTL converter
3. 4 blade style wire terminals (or make your own pins)
These are the links to the parts I purchased,
Radio shack USB to serial converter,
Serialcomm serial to 5v TTL model: TTL-232-5P
Hook-up to bike,
I used 4 blade termials I purchased from my local ford dealer, but you could always make your own with some wire and solder. It's not as pretty as the ~$500 cable from Kawi or the ~$250 sold by someone on this forum but it works, and cost me $58.
To determine which TTL wire went to "In TTL" and "out TTL" on the TTL adapter I just guessed. It didn't comunicate the first time so I reversed the TTL wires and bingo.
Since i've seen others claim there $250 cable works from 04-10 and on 6Rs', I bet the pins stay the same on the bike harness side, but please verify with a volt meter. Your TTL Pins will have 5 volts when check with a volt meter, 2 will have continuity to ground and the last pin will will have battery voltage.
My hook up to the Serial to TTL converter for an 04' zx10r was
Yellow to--"In TTL"
Orange to--"Out TTL"
Brown/Black stripe --"GND"
Red/white stripe--not used
attached are pictures to help.