1919 AJS 750cc V Twin Restoration

[tonyfoale]

Alan,

That old design of taper and nut fitting was never good, particularly when applied to the bigend also. The width of the nut takes away potential engagement length of the pin in the wheels. Velocette eliminated the nut on the bigend.

As you have ground the tapers, the pins must seat in a bit further, has that resulted in having to shim the gear/s on the timing side to restore their lateral position?

The more modern approach of pressed in parallel pins in relatively wide wheels results in a more robust crank. Of course when you are restoring an old engine you have to work with what you have. Good luck with it.
BTW 0.0004" runout will be better than the original spec.