Reply to Old Magnet:
This should help you out:
Hi Richard,
I assume that the gear is not able to drive the points cam. If so to locate the correct position for future instalation you will need this data as well as that supplied by OM. This data is for a MJK Am. Bosch maggie, but holds true for any magneto in that the points open just after the point of maximum flux--resistance felt as the rotor cuts through the magnetic lines of force, if I remember correctly, this is vital to give max. spark potential.
By experimenting you will be able to reset the gear to the cam with the A in the window and the points opening position set to where needed to satisfy the Edge Distance Setting. I set all my mags this way, be they Cat or other, with good results.
This is pretty techo stuff for the uninitiated but worth a try to save the gear and shaft. Only other way is to eyeball another one and reset yours accordingly. Sorry I do not have a pic similar to OM's incase I could have scaned it clearer. Maybe if OM scaned just the pic you might get close for position.
Hope this helps and not confuses,
Cheers,
Eddie B.