How to remove the drive side cam bush?

I see that the timing side bush can be punched out using a socket of the appropriate diameter, but what about the drive side bush? What's the best way to remove a bush inside a blind hole?

A machine shop would probably bore it out. You may be able to get a short section of hack saw blade and cut through it in a couple of places.

Or, find an appropriate size tap, and cut a screw thread in the bush, then with the tap screwed in (or use a bolt?) hold the end of the tap or bolt in a vice/vise, heat the case, and knock the case off the bush?

Removing the old and fitting a new drive side cam bush is the easy 'do it yourself' part. But in order to obtain 100% loading instead of point loading you need to line bore the new bushes! This can only be done with a special (Norton cam bush)reamer because of the blind side. A regular machine shop won't be able to do this for you. Mine were done by Holland Norton Works.

It is easy to remove a blind bush. Find a shaft that will fit into the bush, approx. same size as the camshaft journal. Fill the bush with grease, support the casing firmly under where the bush is. Put the shaft into the bush & belt it with a hammer. The bush will start to come out. As the grease reduces in the hole, replenish so you don't hit the shaft into the casing.
The casing MUST be supporting firmly underneath, or the casing will crack.
I wouldn't renew those bushes unless I have already sorted out a competant way of reaming them first.

Since the replacement bushes need to be line bored by a competent machine shop, let them bore out the old ones and install the new ones!

Hi there, once I had tried to do it myself, better do nothing .......saying that it's not common to see any wear in them, are you sure the bush is worn enough to replace it ,cause line boring is quite expansive.You should do a lot of miles to see them worn!

I am restoring the entire bike from top to bottom, every nut and bolt, and I detected very slight play in the cam when fitted into the crankcases, so I thought I'd go ahead and replace the cam bushes along with the many other bushes I'm replacing in the rest of the bike. I now realize that the cam is unique in that it rides on two bushes on each side of the engine, so must be fitted to both bushes simultaneously. Otherwise, the cam might fit okay on the drive side, for example, but bind on the timing side, or vise versa. Thus the need for the services of an experienced machinist. In light of the foregoing, I'm going to leave the cam bushes alone. Thanks to all for the helpful replies.

Hi, are your cases matched? if not , I agree the camshaft could had a tight point , if they were matched , check one more time where and when your camshaft is tight (are you sure your cases are well joined together, and your cam pulled away toward the timing side when you try to turn it by hand in your cases? cause I can't see any reason your bushes are too tight........

The cases are matched. The cam doesn't bind. I'm sure everything's OK now. Thanks for all the input.