SpeedoDRD Installation

[SpudRider]

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

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.



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.

[SpudRider]

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.



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.

[SpudRider]

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

[SpudRider]

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.

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

[SpudRider]

I re-installed the windshield, and was pleased to note the mounting nuts near the power outlets were much easier to install. 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.



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.

[SpudRider]

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

[SpudRider]

I really enjoy having an accurate speedometer reading, especially with a digital speedometer. 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.

[SpudRider]

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

[SpudRider]

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. I am pleased to report that 12 O'Clock Labs sells excellent products, and provides superb customer service.

[Huck369]

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

[SpudRider]

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

[JTHSPACE]

Nice write-up

[rjmorel]

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

[SpudRider]

Originally Posted by JTHSPACE

Nice write-up

Originally Posted by rjmorel

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. 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.

[rjmorel]

Originally Posted by SpudRider

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. 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.

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