advance is stuck ? How to get it off

[Darryl.Richman]

Ooo, the word 'pry' gives me bad feelings in this area. I would spray the area repeatedly with Aerokroil or some other penetrating lubricant, over several days before trying any brute force on it.

I think I'd put the bolt back in most of the way and then use a small puller that I was certain was hooked to the metal end ring of the cam, and I still wouldn't use a lot of force. You might heat it up also, but I'd remove the mag coil before doing that.

If you bend the centrifugal weight area, the end of the magneto rotor, or mushroom either, I think you'll be really unhappy.

[Allan.Atherton]

1969 BMW R60US - The cintrfical advance unit won't come off the shaft (bolt is out) due to possible rust. What can I pry on to help get it off?
The advance slips on rather loosely, so I wonder how enough rust could form to prevent removal. Probably the bolt was overtightened and mashed the nose of the camshaft out, which locked the advance unit on the shaft. I had a bike like that once, where the PO must have over tightened the unit. I pulled on the unit with my fingers, and the fly weights came off, which stretched out the little springs and ruined them. Eventually I pried the advance's body off the camshaft, and used a file to remove the flared end of the camshaft. I either bought new springs or a new advance.

[VBMWMO]

1969 BMW R60US - The cintrfical advance unit won't come off the shaft (bolt is out) due to possible rust. What can I pry on to help get it off?