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Date:  8-13-2010
Number of Hours:  3.00
Manual Reference:  
Brief Description:  Rotor Tachometer

After trying to purchase another Hall Effect Sensor for the Rotor Tachometer, I experimented with the magnetic pick up from my bike. It did not work with the installed instrument. I went buy several electronic stores looking for the sensor and how they work but it was not fruitful. I tried to contact the South Africa company and another in Canada and I never received a reply.

So today, I took off the overhead and fuel tank tunnel cover and completely remove the Sensor and wiring.

I finally figured out what the problem was for the Rotor Display.

On page 126 in the SH1 assembly manual it says…..
Rotor RPM Display
The rotor RPM display must be connected to a power source and grounding source. In addition, two wires run from the display position up to the rotor head. The two wires attach to a Hall effect sensor, which is triggered by a magnet attached to the pre-rotation ring gear.

My Hall effect sensor had two wires and I did not suspect anything was wrong. I had a red and black wire and I hooked them to the corresponding terminal on the DX9. I did not hook anything to the ‘braid’ terminal thinking that must be for a different sensor. Dan suggested that I check the integrity of the wire so I removed the whole thing from the gyro and cut the wires to put an ohmmeter on it. Then I found out that there should have been 3 terminals on the end of the sensor wire. I found a little white wire under the heat shrink tubing not connected to anything and learned the black wire was connected to the braid. Once I solder a lead/terminal to the white wire and attached it to the DX9, the display seemed to ‘count’ as I passed the magnet across the sensor. I think it’s going to work. I will reassemble they whole tomorrow and test it with the prerotator.
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