Hoople
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TPS seems to be a simple resistor so I would suspect hooking ohm meter to it and rolling slowly to make sure it changes on constant curve, am I right?
Yes exactly. Several important points when you test the TPS. Most meters are slow reacting. If you use a continuity beeper function, be sure it is fast acting or a "flat spot" will go unnoticed. Using a meter is really not the best way to test a TPS but it will have to do. Disconnect it from the harness, and test it by moving the control very very slowly.
Remember that even though your bike is Fuel injected it does have a software accelerator pump just like a carb. It is activated when the ECM sees a sudden change on the TPS.
My 2009 TPS can be changed without any calibration needed. I believe yours would be the same.
A flat spot in the TPS would make the bike perform poorly coming off idle but I don't see it making your pipes gray while not having logged a DTC for open or shorted (hi-lo) TPS. If the connector is easy to get at, it is worth checking.