Z1R Mk2 D3 Crankcase damage

wrote:

I have attached photos of both top and bottom. The original bearing is destroyed (I have a genuine Kawasaki replacement) - I think it cracked along the ring groove and fell apart but there was minimal damage to anything else in the transmission apart from the parts of the crankcase that hold the bearing. So what you are suggesting is to permanently fix the ring in place and fill any gaps in the crankcase surfaces with JB Weld using the bearing to level things out - is that correct? I'm fairly new to this sort of thing and want to make sure my understanding is correct.   
 

Yes. Looks like there's enough of that ring land to hold it in place. Don't forget the punch marks like I showed in the clips. Embedding the ring would help to secure it. I've run bad chains and sprockets before but it never went this far. In the 80's I switched out the tranny and looked at the bearing. It was noisy but no where near as bad as the one you have. Got a pic of it? BTW click insert all  in the attachment section. I fixed yours this time. 
Keep us up to date. 

Steve
 

wrote:

This is what's left of the bearing. Thanks for your help. It might be a while before I get around to doing anything more as I would prefer to do this with someone with a bit more knowhow than me and we are in a COVID lockdown at the moment which means no visitors. Thankfully I can still ride. 

Was this a drag bike or turbo?  If you're going to wait  I'd take the  suggestion of cutting a new groove  and turning the bearing around. My suggestion was to just get the bike back on the road as a normal street bike. if no shop is available  Keep in mind the the gear clusters can't walk around or tranny damage will be the result. Take a look at the shift forks and shifting dogs as well. You may have more than one problem. 
Steve