wanted 1971 A.65 gear change spring cup

[Sticks]

Hi would anyone have an eccentric hole gear change spring cup for a 71/72 A.65
thanks Dave.

[wardy]

Burton Bike Bits list it (doesn't say if they have stock) otherwise a few on Ebay from the USA

[ChrisG]

Part No. is 57-4008. Try Kidderminster Motorcycles 01562 66679 they usually carry stock of most parts for the later OIF models.

[Sticks]

Thanks chaps,have tried burtons,unfortunatel have no stock,will give kidderminster a try

[Sticks]

Kidderminster does not have either,nor does dragonfly looks like i might be struggling to find one.

[wardy]

Have you tried C & D autos?

[boriscross]

I'm asking British only in the US if they have any specifically, of the late eccentric versions. I will let you know what they say. They certainly list the part number at $2 each new. I have found them really good in the past for hard to get parts.
Cheers

[boriscross]

Does any body know A. how much of an improvement this eccentric spring cup made and B. if the drawing and or tool for making it is about somewhere?

[DAVE BRADY]

Hi,

I have one of these cups on one of my A65s and it does make it easier to get the spring pressure even and so make gear changes better. It also has two little notches to facilitate turning it.  The alternative, if a spring has a bias, is to bend the spring.
I currently have mine off the bike so I will take a photo of it with a ruler/tape.  I think a standard one could be modified by brazing on an offset washer and removing the overlap

Dave.

[boriscross]

Cheers Dave I would appreciate that.

[DAVE BRADY]

Hi,

Here is a photo of the spring cup.  I hope it is clear enough.  I would think that the exact amount of offset is not that important so long as the hole is off centre to allow a bit of eccentric adjustment.  It looks like about 3mm with enough room to get a socket on the nut that holds it all in place.

Dave.

[boriscross]

British Only in the USA have mentioned an alternative part number 60-3861. I can't find any mention of this number (A70?) but British Only are normally pretty good. I have asked if they have any of this new part number.
Cheers
Boris Cross

[JulianS]

60 3861 is the tool to adjust the eccentric cup.

Also note what the service bulletin says about the revised cup retaining the original part number - so 2 different cups same part number.

[boriscross]

Baxter's cycle in the USA www.baxterscycle.com have some of the original concentric ones at $14 if anybody is interested.
Looking at the photo of the eccentric one if I could get hold of one we might be able to reverse engineer one. It would be possible to machine them, might be a little heavier. We could take one to a press shop and see what the cost of a tool would be although that might be a bit expensive depending on how many you wanted to produce.

[boriscross]

Dave Brady where are you located? I'm in Worcester no chance of borrowing that one to do a drawing of is there?