Endless Sphere

Really taking shape, jealous off your workshop too. My first thought on the NaOH on the fork was make it a thick slurry and paint it on with a brush and wipe off after 5-10 minutes. Ideally less mess and more control over where it touches. I'd get some elbow length gloves before doing it though, aci...

Haven't seen anyone try to upgrade this type of dirt bike yet, but I am very interested since it looks like that is available in several countries and has better components than Razor or some of the other toys. First impressions about putting more voltage through the system is you will blow your con...

I don't think your picture attached, can't see it. Broad advice for lipo is the same around here usually: Keep the cells as closely balanced as you can, keep them protected from puncture. If you aren't using them for some period of time (several weeks or months) don't store them fully charged. Your ...

Awesome work. Can you post some final specs for the group so we can point the next people that want to make a pitbike at this thread?

Top speed? Cost? Run time or range?

I think the chain and the MY1020 motor keeps that classic look and they come with a mounting bracket already welded on. The chain might be a bit noisier than hubs but I think it would be a touch cheaper too. I mean is the goal a fun toy or a legit vehicle you need to be as comfortable and reliable a...

Throttle is most definitely in pass thru mode. Have not been successful in getting a response through the CA from the throttle to the controller. Throttle will spin the motor when directly connected to the controller and the signal voltage goes up and down with it. Is there another setting that migh...

I have changed the min throttle output voltage and the max. The screen shows the throttle changing position so I know that is working. But when probing the signal and ground on the CA throttle out, the voltage isn't changing. I have a stand alone shunt that I am using. The throttle seems to be in pa...

Very clean looking. What is the throttle? Did that come from Grin or somewhere else?

Short answer: yeah maybe 70Ah would be a good start, probably wouldn't get you 100 miles on a full sized motorcycle because they are heavy. Here's a DIY build to show some of the work involved with a smaller motorcycle https://endless-sphere.com/forums/viewtopic.php?t=105659#p1546035 Longer answer: ...

I ended up getting a C4 tip and that helped me a lot with the larger gauge wire and xt90 ends. Larger surface area for contacting all that metal. I'll have to see if I can find the series but I found a training video from a company that showed how to perfectly set those cups in xt60 and xt90 with so...

Wow, that is a ton of photos. Good work, did you test your set up before everything was mounted and connected on the bike? Certainly don't have to but sure makes troubleshooting a lot easier when all the wires are laid out in front of you.

Looks like it will be a blast to ride once it is complete.

The dimensions are listed in mm on that specification sheet below the description. Had not heard of this company before, interested to hear your opinion when you get the battery

That is a bit busy. You might have to reach out to the vendor for some advice. On my cheap chinese controller, the wire labelled "electric door lock" needed to see the full voltage from the battery to turn on. I spliced a small gauge wire from the main battery line into it and that woke it...

I like how it looks simple and compact. I personally am a fan of powertool or module options. A little less initial cost for trying out this hobby or swapping between vehicles. Also, great idea making them mountable to the bottle cage mounts on most frames. Initial reaction is your price seems just ...

I am pretty interested in this concept. I know there is a majority here that say just get a spot welder but this offers more flexibility in swapping out a bad cell and doesn't need specialized tools to assemble. Additionally, if you were to change the shape of the battery for another application or ...

Here's a little calculator to help with power and gear selection. I think you'll have to put a fudge factor on there for efficiency losses, maybe something like 80% of the listed numbers. 18mph seems a bit low for the power and wattage, seems like you would be closer to 30. https://electricscooterpa...

Have you continued to use old/broken tools for the metal tabs that slot into the battery? Very clean applications by the way, look very professional. I am always jealous of people's CNC routers and their creations

Found a new wholesaler for used lithium. Wondering if anyone had purchased cells from Batteryclearinghouse.com

Their prices seem pretty reasonable although most descriptions state the cells are estimated at ~80% capacity.

Clean looking. Maybe this was answered elsewhere, what made you decide for a belt driven reduction? Why not run the sprocket off the motor?

How much would you budget for say a 72V 16AH pack made from these cells?

What throttle did you use? Does the throttle feel pretty durable? The cheap scooter ones from ebay dont feel like they can take much abuse or bumps, not something you want to feel on a homemade contraption

Insulate with aerogel sheets? Where do you find those? I had seen a video about a smaller company that started making and tweaking the final composition so I assumed it was getting a little more affordable but not to the point where you could put it in a motorcycle. I'd love to put it in my walls at...

Curious if anyone else would recommend tinkering with those 40V ryobi packs to make a larger storage pack. I'm kind of torn between the power tool hot swap convenience versus an enclosed, well weather proofed system. I would be putting this in what is essentially a toy (mx650) so not loads of real e...

Did you order that battery or make it yourself?

Awesome work. Would love to see a top speed run. :bigthumb: Which wheel bearings did you use? Also would love to know alternatives for hydraulic brakes if you were to go down that road. I have a feeling some MTB hydraulics would do it, but would probably need a custom bracket. Either that or weld th...