I have a elf dirt bike was wondering how much is too much to spend on a three piece crank?

Question

size 1.75 with sealed bearings.

Answer 1

I'd usually say around $50 but since you have an elf-sized bike, those parts are harder to come by.  Anywhere from $120-$300 is what I've seen.  Elves are very meticulous because they have to be, one wrong millimeter measurement and the whole thing could be a waste.