Cylinder and head fin rubber inserts

[Gabby]

My engine currently undergoing rebuild has most of these rubber inserts missing. I looked at the cost of replacements and after I picked myself up off the floor, decided not to worry about them. However I'm now curious why they are there - was it to stop some vibration that might ultimately cause fin cracking or some other reason? Any reason why I shouldn't leave them off?
Thanks

 

[dirtdigger]

Yes they are there to help quite some of the mechanical noise of the engine. They dampen vibration to keep it from setting up a ringing noise. You can run without them but you may have more noises. You can get pieces or rubber and cut little pieces like the originals. Or you can do some looking online and on ebay http://www.ebay.com/itm/Honda-CB750...ash=item25b2b3ee1a:g:GxgAAOSwRLZT6GCn&vxp=mtr

 

[Gabby]

Sounds like I should chase up some more then. Thanks for your reply.

 

[amc49]

Like said, they stop a tinny reverb from the fins ringing. Not necessary at all though to have them, the difference not much. The later DOHCs left them off after the early ones had them.