From Newsgroup: uk.rec.motorcycles

Today, working on the shite old bsa, I managed to clumsily knock a chunk
off the skirt on one of the pistons.

Arse.

Started researching replacements only to find they are not very common,
and mostly -u-u-u-u/$$$$.

After much searching I found that I have almost certainly fitted the
wrong ones all those (~50) years ago.

The right ones are higher compression, and I found a pair for a
reasonable amount.

I always thought it should go better than it did, now maybe it will,
after I get the crank sorted, and it all back together...
--
/Simon
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From Newsgroup: uk.rec.motorcycles

On 29/01/2026 16:53, Simon Wilson wrote:

Today, working on the shite old bsa, I managed to clumsily knock a chunk
off the skirt on one of the pistons.

Arse.

Started researching replacements only to find they are not very common,
and mostly -u-u-u-u/$$$$.

After much searching I found that I have almost certainly fitted the
wrong ones all those (~50) years ago.

The right ones are higher compression, and I found a pair for a
reasonable amount.

I always thought it should go better than it did, now maybe it will,
after I get the crank sorted, and it all back together...

Oops. Always easier to fit a decompression plate to lower CR than to
find a quick way to raise it. Have I told the tale about how I did that
on the Vintage Raleigh 350? No, not by stretching the rod.
--
Moto Morini 2C/375
Gilera 175 Sport, Husqvarna 401 Svartpilen
Honda CB250RS (Not Waynetta!)
"Do not adjust your mind, there is a fault in the reality"
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From Newsgroup: uk.rec.motorcycles

On 02/02/2026 12:28, Mike Fleming wrote:

On 29/01/2026 16:53, Simon Wilson wrote:

Today, working on the shite old bsa, I managed to clumsily knock a chunk
off the skirt on one of the pistons.

Arse.

Started researching replacements only to find they are not very common,
and mostly -u-u-u-u/$$$$.

Are C&D Autos still going? Used to be up the road from me in Acocks
Green when I lived in Olton, apparently now in Henley-in-Arden (if they
are still extant).

https://www.yell.com/biz/c-and-d-autos-b-s-a-spares-henley-in-arden-4732149/

The VMCC forum suggested C&D and some other possible sources of SOBSA
pistons.
--
Phone
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From Newsgroup: uk.rec.motorcycles

On 02/02/2026 12:28, Mike Fleming wrote:

On 29/01/2026 16:53, Simon Wilson wrote:

Today, working on the shite old bsa, I managed to clumsily knock a
chunk off the skirt on one of the pistons.

Arse.

Started researching replacements only to find they are not very
common, and mostly -u-u-u-u/$$$$.

Are C&D Autos still going? Used to be up the road from me in Acocks
Green when I lived in Olton, apparently now in Henley-in-Arden (if they
are still extant).

https://www.yell.com/biz/c-and-d-autos-b-s-a-spares-henley-in- arden-4732149/

Had forgotten all about C&D. I used to go there a *lot* (lived in
Sparkhill as a student)

I always remember they had one of lots of different BSA models that
their dad had collected.

Vale Onslow seem to still exist (on ebay at least) as well.
--
/Simon
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From Newsgroup: uk.rec.motorcycles

On 02/02/2026 12:28, Mike Fleming wrote:

On 29/01/2026 16:53, Simon Wilson wrote:

Wotcha

Today, working on the shite old bsa, I managed to clumsily knock a
chunk off the skirt on one of the pistons.

Arse.

Started researching replacements only to find they are not very
common, and mostly -u-u-u-u/$$$$.

I got the pistons for my A10 from Thorntons, near Shrewsbury.
--
^..^ Lone Wolf

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From Newsgroup: uk.rec.motorcycles

On 02/02/2026 14:47, Simon Wilson wrote:

Wotcha

Vale Onslow seem to still exist (on ebay at least) as well.

They have a couple of units on an industrial estate in
Bordesley Green. Last time I looked the site of the original
shop on the Stratford Road was still just a hole in the ground.

Sadly Peter Vale-Onslow passed away just recently.

Cheers.
--
^..^ Lone Wolf

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