Hi Josh,
Yup, the haynes and Bacon are what are throwing me. I have no idea the miles this bike has done, some parts look almost new, and then there are others....
I am indeed talking about inside diameter. I am just not sure what "exceptable" is on a BSA a10 motor. For all I know, mine are at factory spec (but I doubt it!). It would be great if someone could say "this is factory spec, this is exceptable, and this is re-bush time"!
Lee