Hi. Some how when i was installing this thing initially (I never rode my E-bike!) the nut got stuck.. no matter how much WD40 it would just not come off easy. I forced it and now all the threads are flattened...Now what can i fix this? Can i guy a replacement part? Or is my motor Fubar despite the fact it was never used?

You could try a tap and die set like this: https://www.homedepot.com/p/SPEEDWAY-...6#.UYMzMrVwrvE

Just find the one with your size and pitch. It may work. Home depot has a rental section...give them a call to see if they have a tap and die set for rent.

If not, your local machine shop may be able to assist you for a few dollars.

Check the nut too. Its threads may need the same attention.

Yea they are already in the trash pile. (Holding on just incase i need to make a reference)

Im also worried because i know this one is also hollow (to pass the cable)

I might need to find a machine shop... car repair shop?

Also make certain you have the correct nut (diameter, and thread pitch). In fact with something this critical I'd use a new nut regardless. Next time, instead of forcing, back the nut off right away and check to see what's causing the problem. Those threads look pretty bad, but the correct die might just save them. Then again, this is a potential safety issue - even if you can repair the threads, the strength of the axle may be compromised - not a good situation to have, especially if that's a front wheel. Maybe adding a second nut would help, and/or threadlocker. I'd defintely take that to an experienced mechanic to check out before using - it's too difficult to tell if that's safe to use based on your picture alone.

Make sure to practice using the die, or a die like it, on a spare bolt first. They're not hard to use once you have experience, but it's also an easy task to screw up. I would hold the axle straight up in an axle vice and keep the die handle as straight as possible. Defintely use cutting fluid.

In fact, I'd strongly consider letting an experienced mechanic with the right tools do the job. It wouldn't take long, and would probably be the least hassle. You could still learn how to use taps and dies later... on something that isn't protecting your safety.

My boss has one of these kits and agreeded to do the job for me. We also gonna try to weld tire to the fork.

I think that might do it.

Why would you weld the tire (I assume you mean wheel - the axle) to the fork? You do realize that is going to make removing the wheel extremely difficult, not to mention what it would do to the axle?

if you weld the wheel on, you won't be able fix a flat tire

I had the same problem on my crystalyte motor. I chased the threads with a die and then instead of using the factory nut I used a coupling nut that I picked up from the hardware store. Becuase the Rods on the motor don't have half the threads to grab on to becuase it has to fit in the dropouts this happens a lot. A coupling nut is twice as long so it has twice the amount of threads to grab onto spreading out the stress in the threads.

Here's what I was talking about using a coupling nut as you can see it uses all of the threads on the axle that it possibly can spreading out the load on the threads

yeah,i think so,We also gonna try to weld tire to the fork.

This is not a good idea. How do you plan on changing the tire or inner tube with the axle welded to the fork?

Agreed. Welding the hub th the fork is a really bad idea.

Back from the dead.. I meant to try to add some metal to support the rod. I agree welding to the fork isnt a good idea.

change of plans. Now i have to do it on my own.. Coupling nut seems like a really good idea.