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Hi Paul, join the gang! That all sounds really promising. I bought my original B1 new in 1976 and did a lot of happy miles on it. I could never understand some of the stuff that was said about it because none of that sounded like the bike I was riding! My recent US import 1978 B3 is getting close to completing its restoration and I’m really l…[Read more]

Hi SquadronLeader and welcome to the site.

It has been great chatting with you and so glad we got you that B2. Although it appears to need very little doing to it I am looking forward to seeing your progress with the restoration.

If the pictures of your kettle are anything to go by the result will be excellent.

You should get what you need from…[Read more]

Sorry mate I was thinking of the balancer chain guides. The Hy-vo chains are quite bullet proof in themselves so does sound good for you.

I will get the rest of your parts posted.

KK

Good morning

Primary chain has 25mm measured in middle of top run of chain with top case off. My guides appear to be both solid mounted to cases, no sprung tensioner, top guide has no wear at all, bottom just a little. Think we be ok at that?

Cheers karl

Well I will stand corrected if I a wrong but to the best of my knowledge the swinging arm bushes have always been brass. The replacement ones definitely are and I see no reason to have made them in cast iron. It certainly looks like you had a job on your hands there but the main thing is you got them out.

You are right about B3 onwards being on…[Read more]

Finally got this sorted, what a mission. Understanding the actual construction of the swing arm bearings obviously helped. I tried driving the inner steel sleeve in one direction but cast bush at that end just moved with the sleeve after shearing off the bush flange and threatened to disappear in to the swing arm. Then tried driving the sleeve…[Read more]

Rob

How’s your rebuild going, any progress any pictures?

Cheers karl

I assumed you had removed the sleeve. This should drive straight out either way. They can seize if not greased up. Again heat should assist if it is seized. You need to make sure the bush is against something solid but not blocking the end of the sleeve then drive it through from the other end.

I have re-read the Service Manual umpteen times and maybe I have misunderstood the construction. Manual says, “pull out the swing arm sleeve” before removing the bushes. Does the “sleeve” accupy the full width of the swing arm, sitting inside the bushes at each end? If this is the case then my “sleeve” is seized in the bushes as it doesn’t want to…[Read more]

No haven’t tried heating the swing arm so will try that. Battery acid has dribbled all over the swing arm so I have to do some repainting anyway. Will also try the hacksaw cuts. The residual problem is getting some ‘edge’ on the inner end of the bush in order to drive them out. On my Z1 the central collar or sleeve was easily pushed off centre to…[Read more]

I assume you have tried heating the swinging arm? If they are that stuck I would suggest to cut a slot across the end with a hacksaw. Then carefully extend the slot inside as far as you can with a hacksaw blade and a dremel. This will weaken the pressure off the bush and allow to to knock them out.

KK

The details of primary chain wear are in the manual. When installed there should be no more than 32mm play. You need to inspect the upper and lower chain guides for wear and function. One of those is spring loaded at that one has been known to fail.

New Primary chains are almost none existent so if yours has gone replacement I could only help…[Read more]

Cheers for letting me know Jon

KK