SpeedoDRD Installation
 

Tuesday I received my SpeedoDRD from 12 O'Clock Labs, and I finished installing it on Wednesday. :tup:

12 O'Clock Labs offers a number of different models of the SpeedoDRD which are plug-and-play installations for a variety of different motorcycles. However, none of these different models employs the same 3-pin connector used by the Zongshen RX3. Therefore, I purchased the Universal Kit U1.

http://shop.12oclocklabs.com/index.p...&product_id=59

After probing the 3 wires coming from the speedometer with my digital multimeter, I determined the following cofinguration.

Black/Red Wire: Power from battery
Brown/White Wire: Signal from Speed Sensor
Green Wire: Ground

To avoid cutting the main wiring harness, I decided to connect the SpeedoDRD to the wires coming from the speedometer speed sensor. Also, by removing the speed sensor, I could make secure mechanical and electrical connections by crimping and soldering the connections at my workbench. ;) Therefore, I lofted the front wheel, and removed the speed sensor from the hub.

Taking the speed sensor to my workbench, I cut all three wires about 2 inches from the plug end of the unit, and connected the SpeedoDRD using the following method.

http://i442.photobucket.com/albums/q...psf2rgg0bd.png

I connected the positive, Black/Red wire from the speed sensor to the Red wire of the SpeedoDRD.

I connected the Green, ground wire from the speed sensor to the Black wire of the SpeedoDRD.

I connected the Brown/White signal wire from the speed sensor to the White wire of the SpeedoDRD.

I connected the Blue wire from the SpeedoDRD to the Brown/White wire going to the plug of the speed sensor.

Returning to the motorcycle, I replaced the speed sensor on the hub, and installed the front wheel. After lowering the front wheel, I routed the wire from the speed sensor back to the speedometer.

At this point, I decided to tidy up the wiring harness to make installation of the headlight easier. Therefore, I removed the three nuts holding the speedometer, and disconnected the plug from the wiring harness. Then I re-routed the wiring harness outside the headlight mount to make more room for the headlight.

http://i442.photobucket.com/albums/q...psyfibsrrv.jpg

Since the speedometer was removed, I also decided to trim the power outlet panels to allow easier access to the mounting bolts for the windshield. Removing each of the panels, I trimmed the bottom of each with a cutting wheel on my Dremel tool. Then I re-installed the power outlets, and the speedometer.

http://i442.photobucket.com/albums/q...pskk7ytpvh.jpg

Finally, I connected the speed sensor to the speedometer, and the plugs leading to the accessory power outlets.

http://i442.photobucket.com/albums/q...pspcerwnxt.jpg

http://i442.photobucket.com/albums/q...pshjyj76iy.jpg

Before re-installing the headlight, I turned on the ignition key, and tested the SpeedoDRD. The speedometer immediately received a signal from the SpeedoDRD, and the SpeedoDRD flashed the appropriate signals indicating a good installation. :tup:

Next, I programmed the SpeedoDRD for a negative 11.1% input to the speedometer, as shown in the following video.

https://www.youtube.com/watch?v=iScrjr7FxDM

I re-installed the windshield, and was pleased to note the mounting nuts near the power outlets were much easier to install. :tup: Then I re-installed the headlight, and it also installed much more easily without the wiring harness pushing on it from behind. :) Then I went for a test ride to check the accuracy of the speedometer compared to my Garmin GPS receiver. ;)

http://i442.photobucket.com/albums/q...psaexdwxim.jpg

I mounted the SpeedoDRD in a protected spot beneath the speedometer. However, I left enough slack in the wire so I can easily retrieve the unit to re-program it for corrections whenever I desire. ;) After riding around a bit, I determined the initial setting was too 'pessimistic.' Therefore, I experimented some more, and finally configured the SpeedoDRD for a setting of negative 10.2%. This setting appears to be nearly perfect for my Kenda, K270 front tire. :)

I really like the SpeedoDRD; it is very well manufactured. :tup: It is easy to program, rugged, and waterproof. In fact you can run it while submersed in a glass of salt water. :)

https://www.youtube.com/watch?v=5jVpKhV7Eyk

I really enjoy having an accurate speedometer reading, especially with a digital speedometer. :tup: I can more easily compensate for an inaccurate analog speedometer, but I prefer to take a quick glance, and be able to trust the reading from a digital speedometer. ;)

I am very pleased with my purchase of the SpeedoDRD, and I highly recommend it. I am happy I made this investment to improve the accuracy of both the speedometer, and the odometer of my Zongshen RX3. :)

I have added a link to this thread under the Modifications subheading in the Zongshen RX3 Sticky Thread, which is pinned to the top of this forum. :)

http://www.chinariders.net/showthread.php?t=14228

You can purchase the SpeedoDRD for a price of $70, delivered, from a variety of vendors on eBay, Amazon.com, et cetera. I purchased my SpeedoDRD directly from 12 O'Clock Labs, because Brooks offered me a money back guarantee if the unit did not work with the speedometer on my Zongshen RX3. Brooks graciously matched the $70, delivered price from the other vendors. :tup: I am pleased to report that 12 O'Clock Labs sells excellent products, and provides superb customer service. :)

Glad you've been successful with your install Spud, may be the direction I go on down the road..

Thank you, Huck. :) I didn't have any problems whatsoever with this installation. The SpeedoDRD works great with the speedometer of the Zongshen RX3. :tup:

Nice write-up

Great write up and instructions Spud. Did you can the group buy of the other one you were looking at I read about somewhere? rj

Thank you gentlemen. :)

Yes, the potential group buy of the other unit has been canceled. No1Vic in the United Kingdom installed that unit on his Zongshen RX3, and it didn't work. :ohno: See post #73, and later posts, in the following thread.

http://www.chinariders.net/showthrea...t=14694&page=5

If you install it correctly, the SpeedoDRD works great with the RX3 speedometer. :tup:

I just ran mine down the highway and compared it to my GPS. GPS 60mph = RX3 speedometer 67/68mph.
GPS 35 mph = rx3 speedo 40 mph. rj