I didnt think of the bottom end problem, but most of the time wouldn’t the crank need to be replaced anyway, so why the need for machining? I don’t think I would trust a crank to turn 14000+ after it had went through a bottom end failure.
I don’t want it to look like I am singling out this kart or driver or machine shop. I just wanted to know if machining box stock motors is the norm or the exception before I buy something. I would rather go with the ultra fast shifters, but the budget won’t let me. The budget will let me run a box stock class, if this actually is one.