Author Topic: Wanted A10 Alloy head  (Read 530 times)

Offline Plammimam

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Wanted A10 Alloy head
« on: 10.10. 2018 19:53 »
Hi
I am looking for an A10 alloy head for my SR engine. I would like to find one in great condition with not a lot of work required.
Also need a primary chain case cover.
Happy to pay good price for the right bits
Best
Phil

Offline a

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Re: Wanted A10 Alloy head
« Reply #1 on: 11.10. 2018 02:06 »
Hi Phil,
We have a few in various conditions and models etc (also have valves, guides, springs etc)
https://mikesclassiccyclespares.com/product/67-1126/ NOS Road Rocket Head
https://mikesclassiccyclespares.com/product/67-1571/ Used complete Big Valve head

Offline Plammimam

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Re: Wanted A10 Alloy head
« Reply #2 on: 11.10. 2018 04:20 »
Hi Brett
Thanks for the reply, parts look good but need to consider shipping and import to UK. I will get back to you.

Offline a

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Re: Wanted A10 Alloy head
« Reply #3 on: 11.10. 2018 04:57 »
Definitely understand that Phil, we are certainly on the wrong side of the pond at times!
Also have Primary overs if needed- NOS or Good used
https://mikesclassiccyclespares.com/home/shop/?product_cat=&post_type=product&s=a10+primary+cover

Online chaterlea25

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Re: Wanted A10 Alloy head
« Reply #4 on: 11.10. 2018 22:00 »
Hi All,
Brett,
That complete s/h head looks to have had the "Gold Star" valve spring conversion ??

I came across this twin carbed head on eBay USA
https://www.ebay.com/itm/BSA-Genuine-Vintage-A10-TWIN-DUAL-T10-GP-1-CARB-PERFORMANCE-CYLINDER-HEAD/223180171906?hash=item33f6932a82:g:7PsAAOSw2tNbuqBY:rk:1:pf:0

Nice welding job  converting it *good3*

John
1961 Super Rocket
1963 RGS (ongoing)

Offline Plammimam

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Re: Wanted A10 Alloy head
« Reply #5 on: 12.10. 2018 13:22 »
John
What is the valve spring conversion? I noted the valve top caps are not what I would expect for this head assembly.
Phil

Offline muskrat

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Re: Wanted A10 Alloy head
« Reply #6 on: 12.10. 2018 20:53 »
G'day Phil.
I had to do similar when fitting larger A10SR valves into my 54 A7SS head. I found if the standard SR collars and cotters were used the springs would coil bind. I used the SR cotters but machined the taper in the A7 collars to the correct angle for the SR cotters.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Online chaterlea25

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Re: Wanted A10 Alloy head
« Reply #7 on: 12.10. 2018 21:45 »
Hi Phil,
The valve spring conversion was a tuning mod back in the day offered by Eddy Dow (for one)
Gold Stars use "Alloy" top collars (weight reduction)
From memory the bottom collars are reversed to fit the smaller diameter springs
There should be several topics about this on the forum ??
or Google brings up this as a first hit
eborbikes.com/docs/Fitting_notes/Fitting notes for Gold Star valve springs conversion.pdf

The head linked to looks to have steel top collars though? maybe a half way conversion???
Or non SR components fitted  *????* *????*
I have heard that GS springs are also used on C15/B40 but not sure about that  *conf2*

John
1961 Super Rocket
1963 RGS (ongoing)

Offline laneplodder

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Re: Wanted A10 Alloy head
« Reply #8 on: 21.08. 2019 21:47 »
Hi Phil, did you manage to get sorted with your alloy head search?
Cheers, Matt

Offline laneplodder

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Re: Wanted A10 Alloy head
« Reply #9 on: 16.09. 2019 20:15 »
Hi Phil, sorry for the delay, work getting in the way this end!

Hopefully you're able to view these pics..

Cheers, Matt