Finally finished! Electric 50sx

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2/18/2018 2:13 PM

It took about a year longer than I expected but my 5 no wait, 6 year olds bike is finally finished. The timing actually worked out in my favor. I had pushed him too far too soon and riding was way down on his list of "fun stuff". Now he is begging to ride all day every day. Hopefully we will have some action video this weekend. We are at flood level catastrophic thses days, but maybe we can find some dry ground.

Found out a few weeks ago KTM is going to all electric 50cc bikes just aboiut in time for my son to get on a 65. So we will be back at it soon. I'll probably need to start last week...



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2/19/2018 4:21 AM

Been waiting for you to finish up lol. What battery’s did you go with? How much time do you get on a charge? And is it fast? Looks awesome

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2/19/2018 6:59 AM

I think we are in the start of a big change.
Kick ass job man! Can't wait to know top speed, and battery life.

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2/19/2018 11:15 AM

bf884 wrote:

Been waiting for you to finish up lol. What battery’s did you go with? How much time do you get on a charge? And is it fast? Looks awesome

Thanks.

We've got 3 6 cell lipo packs. But I'm probably going to lower the voltage and try to get more capacity. Have not tested a full charge yet, but it sho uld be 25-35 minutes.

Top speed is around 45 mph. I'd like to slow it down some and the lower voltage will cover that.

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2/19/2018 5:44 PM

Wired in series?

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2/20/2018 4:02 AM

bf884 wrote:

Wired in series?

Yes, 18 cells for 72-75 volts.

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2/21/2018 1:14 PM

bf884 wrote:

Been waiting for you to finish up lol. What battery’s did you go with? How much time do you get on a charge? And is it fast? Looks awesome

151 wrote:

Thanks.

We've got 3 6 cell lipo packs. But I'm probably going to lower the voltage and try to get more capacity. Have not tested a full charge yet, but it sho uld be 25-35 minutes.

Top speed is around 45 mph. I'd like to slow it down some and the lower voltage will cover that.

Please get a vid of him ripping it! I’d love to see it.

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If you're not mixing gas, you're not haulin ass.

2/22/2018 1:01 PM

Super cool project for sure. Hows the weight the compared to stock? Any reason you are still running the radiators? Definitely interested in seeing a video of him riding it!

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2/23/2018 11:12 AM
Edited Date/Time: 2/23/2018 11:13 AM

samcampbell wrote:

Super cool project for sure. Hows the weight the compared to stock? Any reason you are still running the radiators? Definitely interested in seeing a video of him riding it!

Thanks!

It weighs 78.6 lbs ready to ride. Stock it was around 86 I think. Add 3'ish pounds for a tank of gas and we are right at 10 pounds lighter.

If this motor can't take the heat, the next step up is a water cooled brushless motor. I'll plumb in a 12v inline pump and use the radiators.

It's practically flooding here these last few weeks, so I'm not optimistic he will get to ride this weekend.

Here is an old video of his modded Oset. It has a 500w motor vs 1400 on the KTM and we were running 36 volts/100 amps vs 72v/180 amps. The suspension was also sub par...

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2/23/2018 2:16 PM

Sooo sick man, would love to see a vid of it in action! Being completely naïve to electric motors where do you estimate its at power wise compared to a stock 50SX?

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2/23/2018 4:11 PM

KCMX wrote:

Sooo sick man, would love to see a vid of it in action! Being completely naïve to electric motors where do you estimate its at power wise compared to a stock 50SX?

It has been really hard for me to find accurate power info, and to calculate theoretical power of the electric motor...

Theoretically this thing is around 10k watts. But that is unlikely. Oset rates their controller at 100 amps and we are running a 200a controller. They use 48v batteries and we are using 72. They rate the motor at 1200 watts.

So I am guessing we may be at 3600 watts which is something like 7-8 horsepower. I saw a dyno sheet for a 2014 ktm 50sx. stock HP was right at 8, but with exhaust etc, it climbed to almost 12.

A general rule of thumb is 5/3 HP gas to electric. So if a mildly modded 50sx is 10hp we would need 6hp to compete. I think we are okay for power, but really can't know for sure until he gets the bike on the track.

I'm to the point of bragging now... But, Justin Thompson and the JetWerx crew just built us a sweet, safe, fun practice track! Sorry about the video quality. I fly a drone almost as badly as I ride a bike.

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3/3/2018 11:20 AM

Looks great! I have seen “E-Mini” a small electric off-road bike, which is eventually replacing the 50cc combustion model.
best bike stickers

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3/5/2018 6:25 AM

What kind of forks are those?

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3/9/2018 5:25 AM

Nice Work!

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3/10/2018 8:05 AM

Awesome job

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3/11/2018 6:27 AM

bf884 wrote:

What kind of forks are those?

The forks are Manitou Dorado Pro's. Rulezman suspension lowered them for us. They are super light weight, and are very adjustable.

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3/14/2018 7:02 AM

151 wrote:

Thanks.

We've got 3 6 cell lipo packs. But I'm probably going to lower the voltage and try to get more capacity. Have not tested a full charge yet, but it sho uld be 25-35 minutes.

Top speed is around 45 mph. I'd like to slow it down some and the lower voltage will cover that.

This is a very cool project and looks well built. Did you use all the MTB suspension and brakes to save weight? I’m also curious what motor you went with and the electronics you used for control.

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3/14/2018 3:06 PM

theinternetkid wrote:

This is a very cool project and looks well built. Did you use all the MTB suspension and brakes to save weight? I’m also curious what motor you went with and the electronics you used for control.

Yes, I used the mtb components mostly for weight savings but also because they are all super awesome. The suspension is just ridiculously adjustable.

The motor is from the Oset 20r. They are readily available and inexpensive brushed motors. The controller is from Kelly Controls. It is a relatively simple controller but is affordable and pretty simple to wire up and adjust.

I got a really cool hall sensor throttle control that uses the stock throttle and cable. You modify the end of the cable to attach to a magnet in an aluminum tube with sensors that convert the cable movement to a signal for the controller.

I am starting the research for a 65 build. At the rate I get things done it will take a couple years...

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3/15/2018 10:36 AM

151 wrote:

Yes, I used the mtb components mostly for weight savings but also because they are all super awesome. The suspension is just ridiculously adjustable.

The motor is from the Oset 20r. They are readily available and inexpensive brushed motors. The controller is from Kelly Controls. It is a relatively simple controller but is affordable and pretty simple to wire up and adjust.

I got a really cool hall sensor throttle control that uses the stock throttle and cable. You modify the end of the cable to attach to a magnet in an aluminum tube with sensors that convert the cable movement to a signal for the controller.

I am starting the research for a 65 build. At the rate I get things done it will take a couple years...

Thanks for the info, I’m interested in putting one together for my kids.

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3/18/2018 7:14 PM

theinternetkid wrote:

Thanks for the info, I’m interested in putting one together for my kids.

Awesome! Let me know if there is anything I can do to help.

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3/27/2018 6:14 PM
Edited Date/Time: 3/27/2018 6:20 PM

We had a nice over the bars crash his first day on the bike, and lots of rain since then. Finally got him to give it another shot today. He is still a little timid, but this is actually a big improvement.


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9/5/2018 7:04 PM

Nicely done! Very nice indeed!

How did you take a part like this:
https://www.ebay.com/itm/1000-W-48V-DC-1020-electric-motor-kit-w-base-control-box-Throttle-f-scooter/151878201347?hash=item235ca57003:g:3Y4AAOSwwbdWP2~b

...and get a "standard" sprocket on it, so you could use a regular moto chain or whatever?

thanks

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9/8/2018 9:43 AM

StevieTimes wrote:

Nicely done! Very nice indeed!

How did you take a part like this:
https://www.ebay.com/itm/1000-W-48V-DC-1020-electric-motor-kit-w-base-control-box-Throttle-f-scooter/151878201347?hash=item235ca57003:g:3Y4AAOSwwbdWP2~b

...and get a "standard" sprocket on it, so you could use a regular moto chain or whatever?

thanks

The sprocket was almost the only part we were unable to machine ourselves or source from outside industry. In the end we welded the Oset sprocket and the KTM sprocket together. I am not thrilled about it, but at the same time it has worked flawlessly.

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9/8/2018 8:42 PM

StevieTimes wrote:

Nicely done! Very nice indeed!

How did you take a part like this:
https://www.ebay.com/itm/1000-W-48V-DC-1020-electric-motor-kit-w-base-control-box-Throttle-f-scooter/151878201347?hash=item235ca57003:g:3Y4AAOSwwbdWP2~b

...and get a "standard" sprocket on it, so you could use a regular moto chain or whatever?

thanks

151 wrote:

The sprocket was almost the only part we were unable to machine ourselves or source from outside industry. In the end we welded the Oset sprocket and the KTM sprocket together. I am not thrilled about it, but at the same time it has worked flawlessly.

I did manage to get a 420 sprocket for that exact motor from eBay..... I think it's a 10mm double D something from an online scooter parts store.

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9/8/2018 8:44 PM

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9/9/2018 6:04 PM

Thanks Mike. Unfortunately for us the Oset motor shaft is a D shape, not double D. Its a real thorn in my side...

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9/11/2018 8:17 AM

Nice build!! The power button on the gas cap is too cool!

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I'm the dude, man.

9/14/2018 10:38 AM

Wow man. That is really impressive.

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9/16/2018 2:10 PM

How good are you technically? Only asking as would love to build an 85 size bike, have got about 2 years till it’s needed but I have no idea how to start off

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Now a member of the Orange brigade

9/17/2018 6:04 AM

shuggs wrote:

How good are you technically? Only asking as would love to build an 85 size bike, have got about 2 years till it’s needed but I have no idea how to start off

The honest answer is I am not that technical. But that is comparing myself to pros. Luckily google and the people you can meet online are very willing to help. At this point I think I can be of some assistance if you want to convert an 85.

When you get ready, start a thread here and we can track the whole build. I just picked up a bigger 50 for my son that I am starting on today. He had a ktm mini and this one is a husky tc50. But the bikes are very similar so not much will change.

My gut tells me that for an 85 size bike you will need a watercooled brushless motor. That comes with its own set of benefits and difficulties. But I would definitely start there. It may even be best to have the bike now, for measurements etc. Just be prepared for the manufacturers to announce factory electric 85's right around the time you finish yours. that's what happened to me!

Looking forward to seeing your 85 get finished!

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