This is his hand built version of a Stealth Electric Bike (Those start at $8k each!). Check out his build logs for this bike here and here. He even made the hub motor. The chassis is laser cut steel that he welded together and it’s powered by a custom pack of LifePo cells. Given the motor and voltage, this bike is capable of something like 50-60mph!

Be sure to check out part 2 which details the friggin liquid cooled motor, internal temperature monitoring and some huge phase wires for the brushless motor.

After I’d read this build – and was just amazed by it, I found out that Greyborg is actually a serious Ebike manufacturer who produces and sells motors, bikes and other parts. (Which explains the resources he could put into the build) I have to say that I definitely admire this guy. If he didn’t live on another continent I would take a road trip just to meet him and check out his creations!

This is my latest hardware project: MotoComp. It’s based on some work by [Bill2009] but I’ve been extending and reworking the code quite a bit. I installed gauges from a 2004ish Honda CBR 600 on my 1993 CBR 600 F2. Typically, this conversion uses a $125 product called “Speedohealer” to adjust the output of a retro-fitted speed pickup to make the speed output accurate.

My goal is to replicate the functionality of a Speedohealer (which is a very mature product, and worth the price if you need it) and add some features while I’m at it.

I’m working on for my F2. As you can see, the display will show MPH, Voltage, Ambient air temp and the current gear. The hardware is an Arduino, protoshield, DS1820 temp sensor, a transistor to handle output to the speedometer, some voltage dividers and a cap or two for filtering signals.

Gear is calculated based on the ratio of the engine RPM to wheel RPM.
MPH is calculated based on tire diameter and wheel RPM.
Temp is measured using a one-wire temperature sensor. I added it because I had the hardware sitting around.
Voltage is directly measured on the bike. Given the history of R/R/Stator issues, I find having the voltage on a display to be really, really handy.

Right now I’ve got the system mostly working, I’m just working on dialing in the speed sensor/healer functions. The cost to build one like this is about $50 for prototype parts, I’ll likely reduce the cost one I have a production design worked up.

This bike looks like a fun project. I ended up passing my XS 850 on and replacing it with this 1993 CBR 600. The bike got some front end damage when the PO slid it into a curb. It’ll be getting the GSX-R front end I had slated to put on the XS. After the front end is swapped, it’ll just be a matter of replacing the gauges and then on to bodywork/cosmetics.

The bike sat for a year. The battery had 10v and old gas in it. I charged the battery and drained the tank, then I put in some fresh fuel and some sea foam. Once I adjusted the choke (broken lever) it started right up. I’ve put about an hour of runtime on the engine and it looks strong!

Yesterday I put the bike on a stand and pulled the front end. The upper bearing popped right out, the lower took quite a bit of work. After a day of hammering on the bearing with a punch, it finally came loose. Once the new bearings show up, I should have the new front end on in no time.

If you’re interested, here’s how to swap to a GSX-R front end:

Get the right front end. I’ve got a 2006 fork, wheel and yamaha R1 brakes to go with it.

Get the bearings, the CBR and GSX-R use the same lower bearing, but the upper is a custom oddity. NGK makes one but it’s impossible to find in North America. Zoran at twfracing turns down a 48mm tapered roller bearing to 47mm.

From there it’s just a matter of parts – 50mm clipons, etc. Finding the upper bearing is really the hard part.