Low end sputter, hesitation

[mininsx_imp]

So what was the conclusion of the OP?

1. Installing an O2 eliminator (a resistor) can soften snatchy throttle response, especially at small throttle openings or on/off throttle. It can also fix the hunting/surging that some folks experience at small throttle openings.

2. It is not necessary to physically remove the O2 sensor, and it's a royal PITA to do so unless you have the right slotted wrench. (This is somewhat controversial -- some people posit that physical removal is smart because the O2 sensor will "fail" if it's not connected to the ECU. I respectfully disagree, because I can't see why that would be true. The O2 sensor is not heated or cleaned by dint of being hooked up to the ECU).

3. Installing an O2 eliminator will make your bike run richer and therefore cooler and may slightly adversely affect fuel economy (I found it negligible or non-existent, but YMMV. In fact, I experienced a slight increase in fuel economy, but that makes zero sense and I can't explain it so I chalk it up to user error).

4. If your bike fuels nicely with the stock setup, don't bother with the O2 eliminator. If, on the other hand, you have fueling problems at low throttle, it's a cheap experiment to see if it fixes the problem (it seems like it usually does).

5. Many aftermarket or race exhaust systems require or include an O2 eliminator, and simply do not have a physical threaded hole for the O2 sensor.

I'd welcome disagreement on any of those ideas, but that's what I got from reading the thread and my own experiments! Ride safe and have fun.

1. Installing an O2 eliminator (a resistor) can soften snatchy throttle response, especially at small throttle openings or on/off throttle. It can also fix the hunting/surging that some folks experience at small throttle openings.

2. It is not necessary to physically remove the O2 sensor, and it's a royal PITA to do so unless you have the right slotted wrench. (This is somewhat controversial -- some people posit that physical removal is smart because the O2 sensor will "fail" if it's not connected to the ECU. I respectfully disagree, because I can't see why that would be true. The O2 sensor is not heated or cleaned by dint of being hooked up to the ECU).

3. Installing an O2 eliminator will make your bike run richer and therefore cooler and may slightly adversely affect fuel economy (I found it negligible or non-existent, but YMMV. In fact, I experienced a slight increase in fuel economy, but that makes zero sense and I can't explain it so I chalk it up to user error).

4. If your bike fuels nicely with the stock setup, don't bother with the O2 eliminator. If, on the other hand, you have fueling problems at low throttle, it's a cheap experiment to see if it fixes the problem (it seems like it usually does).

5. Many aftermarket or race exhaust systems require or include an O2 eliminator, and simply do not have a physical threaded hole for the O2 sensor.

I'd welcome disagreement on any of those ideas, but that's what I got from reading the thread and my own experiments! Ride safe and have fun.
I bought one a couple of months ago and found the same results as above. The surging is gone and the engine runs like it should have from day one. Gas mileage is the same, too.