April has been a brutal month for travel for me but gratefully it's done now, so I can get back into finishing up the sorting of my 74 850.
My last post was about an issue with the speedo gearbox, which I am going to replace (it was rubbing against the hub cover) along with the spacers on that side of the axle. When I pulled the rear wheel I found that 2 of the cush drives were mostly destroyed and in small pieces and one was still okay. These were replaced in 2000 when the bike was restored, but only have a little more than 1000 miles on them. Most of the miles have been spent at low throttle openings, although I have done some brisk acceleration runs and also taken the bike up to 105 mph once. When the engine was rebuilt the head was milled to raise the compression to about 9.2:1 and a new Norris SS cam was installed so the engine is making more power than stock, but it's not putting out full-race power by any means.
I have new cush drives to install when I put the rear tire back on but before I do, I want to make sure that nothing else is wrong that may cause the cush drives to deteriorate quickly.
How long should cush drives last under normal street riding use? Do they deteriorate with time and limited use (they were installed about 8 years ago)?
Is there anything I should look for that would cause the cush drives to deteriorate so quickly?
Thanks
My last post was about an issue with the speedo gearbox, which I am going to replace (it was rubbing against the hub cover) along with the spacers on that side of the axle. When I pulled the rear wheel I found that 2 of the cush drives were mostly destroyed and in small pieces and one was still okay. These were replaced in 2000 when the bike was restored, but only have a little more than 1000 miles on them. Most of the miles have been spent at low throttle openings, although I have done some brisk acceleration runs and also taken the bike up to 105 mph once. When the engine was rebuilt the head was milled to raise the compression to about 9.2:1 and a new Norris SS cam was installed so the engine is making more power than stock, but it's not putting out full-race power by any means.
I have new cush drives to install when I put the rear tire back on but before I do, I want to make sure that nothing else is wrong that may cause the cush drives to deteriorate quickly.
How long should cush drives last under normal street riding use? Do they deteriorate with time and limited use (they were installed about 8 years ago)?
Is there anything I should look for that would cause the cush drives to deteriorate so quickly?
Thanks