B25ss Goldstar.

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lathejack
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B25ss Goldstar.

Post by lathejack » Wed Apr 10, 2019 9:51 pm

Well I have taken on another project, a 250ss. I couldn't resist having a go at it, and I do quite like the 250 motors. It's all registered and is a UK bike, although it doesn't really bother me which country a BSA was originally registered.
image.jpg

It doesn't have any forks or yokes, all I've managed to get of them so far is a pair of legs. So I have been making a few parts myself, using the B50 fork internals as patterns before I reassemble them.
First I machined up a new pair of fork top nuts From Stainless Steel, the genuine item is on the right.
image.jpg

I also machined up a new set of fork damper valves and associated parts such as the main tubes, Pistons, beveled nuts and the stanchion bottom alloy nuts that contain a floating bush. Both images show the parts I made on the left, genuine on the right.
image.jpg
image.jpg

lathejack
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Re: B25ss Goldstar.

Post by lathejack » Wed Apr 10, 2019 10:00 pm

I had to machine the fork damper tubes from solid bar, here the oil slot is being cut.
image.jpg

All the newly made parts befor assembly, they were more time consuming than I imagined. I did buy the short rebound springs.
image.jpg
So I have made a bit of a start, although it is a somewhat odd way to start a project, but needs must!

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koncretekid
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Re: B25ss Goldstar.

Post by koncretekid » Wed Apr 10, 2019 10:20 pm

You might want to read this from the Britbike forum:
http://www.britbike.com/forums/ubbthrea ... rks#UNREAD
Tom
life's uncertain - go fast now

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kommando
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Re: B25ss Goldstar.

Post by kommando » Thu Apr 11, 2019 4:49 pm

Lathejack if you need any info on my BMW SS1000R insert re-engineer KK has added the link to then ask here or PM me. For someone with a lathe and mill its not hard to do especially based on what pics you have posted, beats my turning attempts. As the cartridge inserts are upgraded as soon as the bikes were bought its not hard to pick up surplus standard ones. On Gavin's A65 my mod for preload adjustment was covered by the handlebars so no need for that bit unless the B50 is different. I will not be making any more but happy to pass on how it was done.

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Ian Hingley
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Re: B25ss Goldstar.

Post by Ian Hingley » Thu Apr 11, 2019 8:53 pm

koncretekid wrote:
Wed Apr 10, 2019 10:20 pm
You might want to read this from the Britbike forum:
Interesting to see familiar names on an unfamiliar forum!

Hats off to both Tom and Kommando for their in-depth knowledge. Didn't know you were such a suspension expert Kommando!

Ian
66 BSA Victor Enduro, 72 BSA Lightning, 62 BSA B40 trials, 2015 Truimph Street Twin, 89 H*nda Bros 650, 96 Aprilia Moto 6.5, 2000 Aprilia Moto 6.5

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kommando
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Re: B25ss Goldstar.

Post by kommando » Fri Apr 12, 2019 9:10 am

Not an expert at all, just looking for ways to cope with our potholed roads and came across digressive damping which both promised and delivers if tuned correctly. I have CBR600RR Showa cartridges with shim stacks in my Commando so knew it worked but then found if you fitted them to OIF then you end up relying on 2 bolts with drilled out centres to hold the wheel on. I then found a way to fit the SS1000R cartridges to OIF which I had as I had bought them incorrectly thinking they would fit the pre OIF bikes but when they turned up found them much larger in diameter than the Showa 20mm ones.

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