How to remove the cam from a Cady:
Although it looks like the cam might be threaded into the shaft, it's not. It pulls off. If you have
the special motobecane cam puller,then it'st easy. Their puller threads onto the outside diameter of the cam, and then lets you push on the shaft.
Here's how I did it, I should have taken a pic, but didn't as I doubted that it would work.
First you need the following:
hacksaw, about a 2 inch diameter brass washer or nut. (the ideal size is used for plumbing, on the drain end). They're very common and cheap and easy to cut. The ID of the washer/nut should be smaller than the cam OD. a clamp (steel strap, screw type, used to clamp hoses and their
attachments) and a standard 3 armed cam puller.
OK, so you take the washer/nut and cut a piece out with the hacksaw. Cut out enough (about 1 inch) to allow you to slip it onto the the cam shaft from the side. Once you've slipped the nut/washer on the camshaft, it gives you a surface for the cam puller to grab on to. Before using the cam puller, clamp the OD of the nut/washer tightly, so that the nut/washer doesn't expand and slip off the cam while you're pulling.
Then position the cam puller to grab onto the nut/washer, turn it with a wrench and watch out. It loosens with a big bang and the whole setup can fly out a bit.
Then you have to replace what you need to and set the timing.
Setting the timing isn't much fun either. It's done by positioning the cam. Each time you position it and measure the timing delay, you may have to reuse your pulling contraption. But each time it comes off a little easier.
I have the manual that has pictures and instructions of how to set the timing. If anyone needs it, just email me and I'll make and send you a copy for a few bucks).