Originally Posted by CJD197

I suppose the runout could be caused by poor manufacturing, but I would hope that Harley keeps the tolerances pretty tight for new cranks. The allowable in the S&S instructions is .003". For us end users, the main thing to know is that if the crank does twist, it's easiest to check for it by checking the runout. If it runs with a lot of runout it will quickly chew up that bronze bushing you see in the cam plate. Once that wallows out, the oil pump is next to go, resulting in low oil pressure.

That's why an oil pressure gage is high on my upgrade list...the more I study up, it seems that most internal problems on our TC's can be caught early by looking for a change in the way the oil pressure behaves.

Originally Posted by RIPSAW

Once they went away from the gear drive system on EVO that required them to true the cranks (by a bending process) they went to the chain drive. This is very forgiving in runout requirements. The cranks are simple pressed together. The can be out .012 at the sprocket end. The oil pump drive closer up has a loose fitting D drive from a flat milled on the crank. One reason the pump is centered with tapered pins and not doweled.

Originally Posted by CJD197

Interesting. Also unfortunate, as that means many later owners would be unable to convert to gears unless they remove their crank and have it trued. At least it is fairly easy to check when you're inspecting your tensioners.