Just let it cool down by itself, To heat, you need a torch. Try to borrow one becuase to buy it, it will set you back about $40..Or you can get one at the home depot in the hardware section. Map gas will probably do it, But for quicker results, you can get a map/oxygen torch and that heats up metal quick. But if you have never used an oxygen torch before, you may want someone to show you how to go about it, you can melt trough metal real quick and then your axle will be junk. also, oxygen torch must be adjusted to get the flame correct and it is a lot easier if someone shows you. I have had manco karts, which axle are you talking about front or rear?
They are threaded all the way around.. Theres a nut that holds the wheel one.. I had to straiten all 4 of mine too.. The rear axle is just a threaded rod that runs through a tube and is tack welded in there.. You can leave a nut on the threads to protect them from getting messed up... If it's the little kart(sounds like to me) You can just throw a cheater bar on the axle and bend it back.. It doesn't come out.. It's in there forever...
If it's a bigger kart with a live axle you will have to pull the axle out and heat it and re-straiten it most likely... Or if you are good with this type of stuff you can just prop it up reversed and put the bend in reverse... If you aren't practiced up and haven't done that kind of thing before I would recommend getting GOOD and hot.. cherry red hot... then work it back strait..
If it's a bigger kart with a live axle you will have to pull the axle out and heat it and re-straiten it most likely... Or if you are good with this type of stuff you can just prop it up reversed and put the bend in reverse... If you aren't practiced up and haven't done that kind of thing before I would recommend getting GOOD and hot.. cherry red hot... then work it back strait..
a few times iv bent axles back straight on karts. I just used a cheater bar and then welded bed frame angle iron to the bottom of it as far out to the wheels as possible and didnt have any problems after that :thumbsup: bedframe is hardened steel for what reason i dont know. Fat people or other bedroom activities :evil_laughter:
You dip them in carbon and It will harden then but don't use water it will make them brittle. if you want you can dip the parts in a hot oil there is lots of carbon in oil. I learned all this from my grand father. he was a machinist and fabricator I use to work in his shop welding and using laths and mills all really old stuff that he pieced together. I miss that old man he has been gone for over 30 years. He tought me a lot .. We use to set in his shop ( I was probably 14) He would say " boy get in the ice box and get 2 beers....it would be the end of the day and he would give me one and him one :smile: then he would say" one or two beers is ok son ...but more than 2 will make ya stupid " LOL ..he was a smart old man ...and I learned a lot from him working on his antique motorcycles ..