It is very easy to do a lambda manipulator, a device that "tricks" signal from lambda sensor in order to enrich mixture. You have to make a voltage divider (see picture below).: as z1 I used 1kOhm, z2 4,7 kOhm. V input comes from lambda black wire, V out the black wire lambda to ECU. As ground you can use the grey wire from stock lambda.
There are some lambda manipulators for sale (ie fat duke), but I didn't like the resistor ratio (1/2) because it lowers too much signal to ECU. A narrow band lambda at closed loop produces voltage from 0.2 to 0.85 V. A ratio of z1/z2=1/2 lowers about 40% the signal to ECU, ie from 0.85 volt to 0.5V. I tested the 1/2 ratio, the bike seemed to be sluggish and had exhaust explosions from unburned fuel. I used 1/5 ratio that lowers signal about 20% and tested again the bike, was better. No check engine, no hesitation, better response, like if I had installed a rapid bike easy. I have done all the connections without soldering, just tying together the wires with resistors and using tape.
Make sure to mark each cable in order not to mix them and tie the wires very well in order to avoid fire!
I also used 2 new connectors in order to install the voltage divider "plug and play", and can put back stock lambda wires without cutting and connecting wires.
Last edited by duke200; 09-01-2018 at 09:31 AM.