Mk3 Rear Isolatic Collar Touching Frame Tube

Have the power unit out to replace original rear isolastic to the Mk3 type and decided to place pieces of the new parts to check clearances. This is what I encountered where the set screw collar that I believe is suppose to be on the right side does not rest against the tab. This is a 1972 frame. If I take the collar and place on a 1974 Mk2 frame that I have, no problem.



Here is a comparasion from the adjustable to the original collar.



My arrangement. As you look at the picture of the loose isolastics, right side would be the right side of frame.



Any ideas or suggestions? Or is this incorrect? Missing something perhaps or won't work? My original iso rubbers are still good, one ptf washer was shot and other side had a piece of plactic made and was shoved in. Just to test, I assembled the original buffers with new ptf washers & one .020 in. spacer back in the cradle tube and getting about a .006 gap on one side when compressing both collars. Also it's centered. It seems with the Mk3 adjustable when I line the assembly up to the cradle tube it doesn't appear centered. Thank you for your replies. Jerry

Doesn't the adjuster go on the right side?

travelerjerry said:

Any ideas or suggestions? Or is this incorrect? Missing something perhaps

Just to test, I assembled the original buffers with new ptf washers & one .020 in. spacer back in the cradle tube and getting about a .006 gap on one side when compressing both collars. Also it's centered. It seems with the Mk3 adjustable when I line the assembly up to the cradle tube it doesn't appear centered.

Click to expand...

I think that fixed collar goes on the front Iso.
Front:


Rear:

http://www.norvilmotorcycle.co.uk/

So I may have been given the wrong collar for the rear isolatic assembly? Noticed that it is not the same size as the other collar.

travelerjerry said:

So I may have been given the wrong collar for the rear isolatic assembly?

Click to expand...

Yes, I think so.

Well, guess I didn't see that when I opened the package. Must of bought this rear isolastic 2 years ago from a e-bay vendor, front also but at a different date. I know I didn't have both isolastics out and the pieces accidently got switched. I was ready to go back to the original set up after scratching my head Sunday afternoon. :? Thanks L A B and everyone else. This Forum is very helpful.