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EXUP Servo


Some time ago I decided to try to build an EXUP servo eliminator. As many of you know, I do not stage the video's. They are shot in one take and I just post it as it happens with very little editing. During the process of attempting to build this, I found a very simple way to remove the cables from the EXUP servo and the bike (with after market pipes) will function fine absent the cables. After removing the cables, you could just re-install your fender and go on about your business. With that in mind, this video is now more educational than any sort of performance improvement. This modification is really the building block for future modifications I have planned. This video is too long to upload to Youtube in one part. I went ahead and split it into two parts.  


High Quality version here


Part 1



Part 2


3/24/09 Blog Entry: Now some technical stuff. This is preliminary information that I will build upon. I am sharing my thoughts, so don't take this as gospel. I spent a lot of time with the EXUP servo understanding how it works. I have a solid understanding of it's electrical operation. 

There are two wires that feed 13vdc to the servo motor. Black/red and a black/white wires power the servo motor. They reverse polarity to change the servo's rotation direction. The white/red stripe wire is the wiper arm of a potentiometer. This potentiometer produces a voltage that represents the servo's position. Position 1 is 4 volts and then position 2 is 2.6 volts. I have had my LM-2 hooked to the white/red wire. From the data, it appears 4 volts is closed and 2.6 is open. The same black/blue and blue wires that feed the other sensors with ground and 5 vdc also feed this potentiometer with ground and 5 vdc. The potentiometer inputs measure 10k ohms with the connector removed. I have gotten closer to getting an eliminator to work. One more day should do it.