Anybody knows how to wire the rezistors on that o2 sensor plug? The plug has 4 wires: blue, yellow, strip brown and simple brown. How to bridge those wires and what.s the value of the rezistor/rezistors in order to give that signal to ecu for a richer afr? So far, from the manual, i found that the voltage on output must be 0.8 v for a richer afr. If just i could find how to bridge the wires, the rest of it would be more simple.

 

The output voltage varies, no set value (as a resistor would give) will give you an across the board richer setting. Additionally, the O2 sensor really only comes into play in closed loop operation which is not all the time. For the most part it is only at light / steady throttle riding. Your best bet it to go with an aftermarket fuel controlled such as an Electronic Jet Kit (EJK). The EJK lets you tailor the mixture across the RPM range.

 

Used 02 sensor zirconia-type. It's in fact battery (to be more precise - solid oxide fuel cell) what generate voltage while afterburning exhaust (like exhaust catalyst).
Voltage also depends from sensor temperature, and in fact EFI read only lean or rich "binary" values according to voltage graph:


You can't replace sensor by rezistor - EFI readed by voltage. 0.0v after start will give tou you "FI light" and 33 error code (looks in service manual in "FUEL SYSTEM (DFI) 3-41; Backups chapter").
You can't use resistor between EFI and Sensor to lower voltage - you dends with electric current from sensor (U=IR) what not constant value.
Present on market "eliminators" (better to search as "simulators") work like simple fixed voltage implusle generators powered from heater. EFI tihnks what mixture always same and not correct it - in fact it's open cycle with fixed fuel map. With fixed map you can use EJK/PC to overrive injector open timings.

 

Each 330 Ohm resistor goes across the white tab.
Blue and yellow is the signal, and the brown wires are for the heater.