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What does the EXUP servo emulator do?

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Like the blurb in that link says:

It fools the bike's electronics into thinking the EXUP servo motor is still there even after you removed it to install an aftermarket muffler.

 

The other (cheaper) option is to actually leave the servo motor in place, but remove the control cables connecting the servo motor to the EXUP valve.

Edited by YZEtc

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Ok...I still don't know anything about this. I just bought a 2009 wr250x, and it already has an FMF pipe...how do I know the previous owner did either route on the servo motor?

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