It's not that I don't trust what CCC is saying, I just like to know all the facts.

Let me just warn you, that there are different types of PCIII's.

You get a road legal version (PCIII EX) and a race version. The road legal versions have limitations and will not allow you to remap certain RPM ranges. They made this so riders cannot mess around with the emission law regulations and make the bikes illegal to ride on the road. Maybe they introduced this with the new XT PCIII's.

If you read the race version instructions, or the normal PCIII we have been using for a few years now, you will see it is not road legal and must only be used for racing where emission laws do not apply.

I was under the impression that the road legal versions will not allow you to map anything below 4000 RPM, but anyway, that�s what I thought, might be wrong and differ from bike to bike.

The race version you can do what you like with and map any RPM and throttle range.

Some things still don't make any sense here.

One side say to disconnect and another say to leave it plugged in.

Disconnecting it and not running the O2 eliminator will most likely bring up an error message on the XT and also send the ECU to run some sort of default fuel map or something like that.

The O2 eliminator is only there to give the ECU a fixed reference point to do your mapping from and to prevent an alarm.

Leaving it in might cause the ECU to override anything the PCIII tells it, so making the PCIII useless for certain RPM ranges. That I can understand, but if this is where to bogging comes from, it will remain there.

Sure the bogging is caused by either ignition of fueling and if it is fuel related, then the PCIII should sort it out, assuming you can disconnect the O2 sensor and preventing the ECU from trying to make constant changes and you use the race version of the PCIII.

I think we are dealing with multiple issues here.

One, could the new PCIII's be the EX versions or running the EX software preventing us from mapping certain RPM ranges and the bog remains, or is there something else involved. Maybe they want you to remain road legal so they are forcing you to use the O2 sensor.

I cannot understand why the O2 sensor removal will cause the bog if the fueling is right. If you can set up the fueling correctly with the PCIII, it is right and any bog must be caused by something else.

The O2 sensor is basically a resistor that remains fixed and provide a fixed reference for the ECU. Why is the fixed reference causing a problem? It makes no sense to me.

In my mind, if there is a bog, and it is caused by the stock ECU providing the incorrect amount of fuel to the motor. To fix it you have to remove the O2 sensor, force the ECU to use a fixed map, since the reference never changes and then remap it with a PCIII race version to get the fuel delivery correct.

If the fuel is right and there is still a bog, then the only other thing that can cuase it is ignition.

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