Topic: Restricted to 1st gear and Neutral only

[CB500FK0]

I removed the bearing since it was already protruding, and as you can observe, it was fractured. Over the weekend, I will evaluate the various possibilities available to me. I would like to express my gratitude to everyone for their valuable suggestions and assistance. This is truly an exceptional community of genuine experts. Cheers!

[pekingduck]

Wow!  That is a failure I've never seen or heard of before. There very likely was no assembly error. The locating pin is likely still in place, and the actual bearing looks intact and complete.  I'm wondering why there was a side load pushing that loose part out. There are witness marks on the inside of the broken-off piece.

Could a mis-shimmed output shaft be the cause?  Or did someone hammer on the countershaft sprocket end of the shaft for some reason?  If the locating half-ring around the large countershaft output bearing was missing, it could have allowed excessive endplay.

In all honesty, I think it could run forever like this, without that end plate of the bearing race/case.  Or a machined aluminum plug just pressed in place so oil wells up and feeds the bearing. 

[dave500]

does it shift gears now?

[CB500FK0]

does it shift gears now?

Yes, it now shifts through all five gears.

[grcamna2]

Wow!  That is a failure I've never seen or heard of before. There very likely was no assembly error. The locating pin is likely still in place, and the actual bearing looks intact and complete.  I'm wondering why there was a side load pushing that loose part out. There are witness marks on the inside of the broken-off piece.

Could a mis-shimmed output shaft be the cause?  Or did someone hammer on the countershaft sprocket end of the shaft for some reason?  If the locating half-ring around the large countershaft output bearing was missing, it could have allowed excessive endplay.

In all honesty, I think it could run forever like this, without that end plate of the bearing race/case.  Or a machined aluminum plug just pressed in place so oil wells up and feeds the bearing.

A blind plug pressed into the hollow transmission shaft to allow the oil pressure to well-up inside the shaft?
Or a plug over the end of the case(w/ a bit of JB weld?)where the other one was ?

[pekingduck]

A plug pressed fit over the end of the case (secured with JB Weld or tacked in place with a couple spots of heliarc weld) where the other one was.  But you'd have to be sure the output shaft was not floating side-to-side.

[HondaMan]

This is one for the archives! I've not seen that one before, either.

[bryanj]

Why bodge it, a days work would see that fixed properly, i also have never seen that before

[dave500]

yeah it needs replacing,youll have to find a used bearing im sure its NLA?

[bryanj]

I have to ask what the engine number is, the very early cases had a different shape at the front and these bikes achieve a premium price a bit like a sandcast 750(but not as much).
Personaly i would appreciate it if you would let me know the build date and frame number from the vin plate via pm so i can add it to my list of known dates.

[grcamna2]

The countershaft must have sustained a very strong shock to break that;open the cases.

[rotortiller]

I am pretty sure the bearing holder is pinned into the case. To replace it means splitting the cases. The other choice is ignorance and then redneck it. The holder has an opening at the top to collect  lube into the hollow gear shaft, you need that feature. If a redneck had the cases apart and was the cause; it is quite possible the thing needs disassembly, a visual and proper repair. I have seen locator pins buried into cases from misalignment.