Sketch Coleman is from Perth, in the south-west corner of Australia, and he has made some videos that documented his conversion of a Honda CRF 250X into a super-moto. I really like the way it turned out (acceleration is 2.9 seconds from zero to 60-MPH, top speed 100-MPH), so let’s take a look.
The three biggest decisions when contemplating an electric conversion of a motorcycle that you’ve chosen are which motor, controller, and battery system will you be using? This is the reason I will occasionally be writing about conversions I have found, in order to help readers see what works.
Sketch got ahold of a Motenergy 75-7 motor from a Zero motorcycle. The controller is a Mobipus 72600, and you can. The battery is a custom 20S unit (20 lithium cells in series), which was built buy Jonescg. In the near future, I will be writing more about high-amp battery packs and their construction.
Youtube Video, Part One, 5 Minutes
In part one, he introduces the idea for his project and describes what he’ll be doing to the Honda CRF 250X.
Sketch first came to my attention when it was suggested on an electric bike forum that adding aluminum fins to the rim of a large direct drive hub motor would allow it to run more power without overheating. Everyone there thought it was a good idea, but Sketch was the guy who actually paid to have a bunch of sets made , and put them up for sale at reasonable prices. They work (I have a set), and as a result, Sketch was able to run more power through his personal hot rod Qulbix Raptor ebike .
Part two, 23 minutes
This video lists the majority of the major component details. He shows the mounted motor, using #520 chain. He has a large custom rear sprocket from Rebel Gears in the US. The wheels are 17″ motorcycle units with 320mm brake discs.
Since super-motos run on smooth tracks, they don’t have to deal with potholes, curbs, or off-road obstacles. As a result they can use a smaller diameter rim, which is lighter and stronger than a larger rim.
Here’s a quick index for reference, Motor mounts are shown at 3:03
3:33, taking a look at all the parts on a table, that will be going into the conversion
4:44, the Mobipus 72600 liquid-cooled controller
5:22, a dashboard for the Mobipus controllers
6:06, wifi module
6:30 Domino potentiometer E-throttle
6:55, ignition switch, 2-position for pre-charge
7:27, main contactor between battery and controller
7:44, kickstand safety, plus hand brake activation safety
8:38, 1200A battery, 20S, 72V nominal, 82V fully charged, 5P, 40C cells
9:44, Electric coolant pump
10:24, Ultima Plus 12V wiring harness
11:18, DC/DC converter
12:12, brake handles
12:40, replaceable crash knobs
13:16, turn signals, pop-off style for occasional races
15:45, spinning-up the motor on the bench, adjusting the settings
20:20, mounting the controller
Part three, 18 minutes
The sketch starts part three by describing his recent accident and injury
4:30, discussing a dozen more small parts that were needed
11:11, a walkaround on the completed bike
15:35 Hooning videos
16:56, discussing what’s next
Part four, ten minutes
0:46 adding decals
2:32 discussing everything he needed to get the bike registered for road use
4:18 taking the bike to supermoto competition
Leave a Reply