I see.

Does the ECU go from open to closed loop at around 15% or closed to open.

The question still remains as to why some XT's surge and some don't. If the all run the same ECU's and software then let's remove that from the list of problems.

This leaves me with the following.

Did they have a bad batch of O2 sensors, where some sensors had a different output voltages or that the output tolerance on these sensors are to wide that it causes wrong inputs to the ECU or maybe it is the fuel or some of the other sensors on the bike causing problems.

On the 700Raptors I have had a lot of them with TPS sensors going faulty, so maybe it comes from the TPS itself.

Kev, you mentioned that you had 2 XT's and one would surge and the other not. Where both mapped with the tuninglink and both had the o2 sensors removed???

Anyway, lets see what you find.

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