Z1OwnersClub GB

My 75 Z1B rear sprocket carrier has movement in it, approx 1/8'' rotationally and approx same laterally. This causes snatchy drive and inconsistent chain tension .
Took it all apart today suspecting the cush rubbers at fault, they appeared fine (last owner said he replaced them with all new wheel bearings). All components of the wheel spindle present and correct. Anyone know if cush rubbers can be measured, they are pricey @?70 a set so I don't want to rush into buying new ones if the fault could lie elsewhere (although I don't know what else it could be).

Years ago I used to glue bits of old inner tube in small bike cush drives to take up slack - anyone done similar on a Zed?

Also manual shows a spacer behing the sprocket for the B model, none fitted to mine- is this a problem cos there is a washer behind the front sprocket I assume to give more clearance, my concern is that having one and not the other will affect chain alignment.

Roscoe, I've seen these rubbers work even though worn. Meaning they have to be really bad before they loose their buffeting function.

I've also seen a method of repair, where they use that black gasket self-setting goo, squeezed into the worn spaces with dummy blocks in the rubber to take the place of the mating hub, until the rubber compound sets.

I would examine closely the *sprocket bearing* (my guess). It's often the one, of three, that goes un-replaced and is the usual cause of both lateral and radial play in the sprocket. There are three bearings in the rear hub, two in the actual hub and one in the sprocket coupling assembly. The bearing replacement set comes with only two!

Also worth a check is the chain. Test tension in various positions to see that it hasn't unevenly stretched.

RegardZ.

John, I've used an old inner tube to good effect many times in the past.
Just cut some bits to size, whack 'em in, and away you go. As inner tube is natural rubber composite, it does a splendid job, and no apparent side effects, apart from saving you ??????'s

GARN- All bearings are new and AOK, so it seems that the cush rubbers are at fault. Chain is worn unevenly so will be replaced even though it measures only 50 % worn.
Gonna go with the old inner tube method Pigford, and see what happens.
Thanks
John

With it all bolted-up you should not have 1/8" lateral movement, that suggests the bearings knackered or the collar is very worn or both.

INERTUBE FOR ME EVERY TIME

Done the deed with the old innertube today and its worked a treat
Bearings and collar are new so no worries there, spindle not worn.- Thats ?70 saved, now whats next on my list...........

Nothing wrong with re-using an old split rubber

Roscoe & others, just out of interest, do you use contacts adhesive to hold the pieces of inner-tube to the existing cush rubbers or just jam them in?
RegardZ.

GARN - Evo stik contact adhesive, degrease cush rubbers and cut pieces of innertube using cellulose thinners before applying glue. Best to stick inner tube on the non loaded side of the cush rubbers.