I made a bolt for the kickstarter of a friend's motorbike, as the
standard ones always bend. Used 4140 high-tensile steel, but now
thinking it might be improved by heat treatment.
But I've virtually no experience with this process, so:

Does it make sense, given that there is a thread on the bolt?
Will scaling or warping change its size and shape?
Is it easy enough to do?

Thanks
Jordan