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The secondary throttle plates (or "secondaries") are not operated by the throttle cable but by the ECU through a stepping motor. If you start the bike you should be able to observe these plates close and open without any input from the throttle cable. This is part of the ECU self-test/calibration.

These secondaries are mostly there to protect the bike (and you) from delivering power beyond what the bike can handle. In lower gears the motor can produce so much torque that you can do an uncommanded wheelie, and in the highest gears you could exceed the maximum structural speed of the bike. In those situations the ECU smoothly closes the secondaries to limit power output of the motor.
 

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Two screws to remove the secondary plates from their axle. But the ECU doesn't just close the secondaries. It also reduces the fueling to match the reduced airflow. If you only remove the secondaries and don't do anything about the fueling, you are now running a too-lean mixture. That could cause damage to the motor.

The most common method of overriding this safety feature is by using what's commonly mislabeled as a TRE. This little device (you can solder one together for a few dollars) fools the ECU into thinking it's in fourth gear (the only unrestricted gear) all the time.

Have to add that this is more related to the DL1000 though. The DL650 produces less power and the power gains from a TRE are very minimal.

(TRE means Timing Retard Eliminator. On carbureted bikes retarding the timing was the way to implement the same safety feature. The device that disabled the feature was therefore called the Timing Retard Eliminator or TRE. That name has now stuck for any gizmo that overrides these safety features.)
 
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