Author Topic: BSA A10 Alternator primary chain cases.  (Read 4757 times)

Offline Flatboy 1950

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BSA A10 Alternator primary chain cases.
« on: 16.10. 2010 18:01 »
Hi Chaps , I have a set of the later A10 Alternator pri. cases with a chromed round cover over the alt.
My question is : Are all the inner pri. mountings the same ?? Will these alt. cases fit a "gen" motor ??
Since the windings mount on the outer case , there is no reason to have changed the mountings of the inner case. (??)
Or is there a special left crankcase for the alternator inner primary to mount to ??

Flatboy1950

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Re: BSA A10 Alternator primary chain cases.
« Reply #1 on: 16.10. 2010 20:53 »
G'day Fatboy 1950, Welcome to the forum.
                                                                   A rare item you have there, mostly used on police models. I remember reading somewhere that the inner cover is different but would bolt to the cases as normal.
 A friend down here has a ABSAF Goldie that came with an alternator and said the covers would fit my A10. Just waiting for him to go on holidays so I can nic'em.
                 Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
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Muskys Plunger A7

Offline trevinoz

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Re: BSA A10 Alternator primary chain cases.
« Reply #2 on: 16.10. 2010 22:46 »
Flatboy,
               I suppose the cases will fit but to fit an alternator to a generator engine you will need the alternator crankshaft.
Trev.

Offline Flatboy 1950

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Re: BSA A10 Alternator primary chain cases.
« Reply #3 on: 17.10. 2010 07:35 »
Hi Chaps , A lad whose cases have been ruined by an "expert welder" wants to use these on his gen. equipped A10 to get it back on the road , no intention of installing an alternator.
Hence the question : Will they fit ??

Offline Flatboy 1950

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Re: BSA A10 Alternator primary chain cases.
« Reply #4 on: 17.10. 2010 10:48 »
Here are pix of the BSA primary chaincase.

Offline Flatboy 1950

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Re: BSA A10 Alternator primary chain cases.
« Reply #5 on: 17.10. 2010 12:42 »
Hi Chaps , Well I looked at the pics of the A10 on the dyno , with the outer primary off & to me it looks as though the mounting of the inner is exactly the same as the inner " Alternator " case ....
Thanks , Flatboy 1950

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Re: BSA A10 Alternator primary chain cases.
« Reply #6 on: 10.06. 2011 17:34 »
I'm on shaky ground here but I think the Goldie cases have different holes for attatching to the crankcase and possible the large hole at the front is maybe larger on a Goldie, I'll be happy to be put straight though - knowledge is power
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline Flatboy 1950

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Re: BSA A10 Alternator primary chain cases.
« Reply #7 on: 10.06. 2011 18:25 »
Hi , I am in South Africa & the postage from here normally kills any deal !!
The Post Office here also will not insure any items posted to the UK & continent !!
I don't need std. cases , my brother had 3 s/a A10's & 2 plunger A10's years ago , but they are all long gone.
I doubt if I will ever use them , so they can go but local sales are so much easier.

Regards , Flatboy.

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Re: BSA A10 Alternator primary chain cases.
« Reply #8 on: 06.07. 2012 10:05 »
Hi Flatboy,
I have the same primary chain case as you on my A10 - with the removable circular cover over the crank shaft end spring. I have never seen another one like mine until I came across your photo in the forum just now. Do you know anything about why they are different from the "usual" one that has a dome instead of the removable circular cover?
Bill

Offline Brian

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Re: BSA A10 Alternator primary chain cases.
« Reply #9 on: 06.07. 2012 10:26 »
The parts book lists different numbers for the inner covers but that doesnt mean they are not interchangeable. You would have to offer them up to the bike and see.

All the ones I have seen on A10's have had the removeable chrome cover, the B series have a one piece moulded cover.

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Re: BSA A10 Alternator primary chain cases.
« Reply #10 on: 06.07. 2012 11:54 »
Some police A 10's had both generators & alternators.
The geny was connected to the bike as per normal
The alternator was on a separate circuit with the 12 V battery, radio & flashing light,
So it should fit.

As the others have said the alternator covers are as rare as rocking horse poo.
Should be able to find lots og blokes willing to swap you two standards for that one.
Bike Beesa
Trevor

Offline fido

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Re: BSA A10 Alternator primary chain cases.
« Reply #11 on: 06.07. 2012 14:07 »
What a confusing thread!  *conf* I take it the references to generators actually mean dynamos? I tend to think of the flywheel magnetos with separate coils for lights etc. (used on stuff like Villiers 2 strokes) as generators, otherwise you have a dynamo or an alternator.

Offline iansoady

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Re: BSA A10 Alternator primary chain cases.
« Reply #12 on: 06.07. 2012 14:34 »
What a confusing thread!  *conf* I take it the references to generators actually mean dynamos? I tend to think of the flywheel magnetos with separate coils for lights etc. (used on stuff like Villiers 2 strokes) as generators, otherwise you have a dynamo or an alternator.

Indeed.

However I believe our transatlantic cousins call dynamos generators. It is confusing as both dynamos and alternators are in fact generators.
Ian.
1962 Golden Flash (arrived)
1955 Velo Viper/Venom (departed)
2004 Triumph Tiger 955i (staying)

Offline Flatboy 1950

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Re: BSA A10 Alternator primary chain cases.
« Reply #13 on: 06.07. 2012 16:54 »
Around here , dynamo is that little thing on a bicycle that is friction driven to light the cycle lamp.
DC comes from Generator.
AC from Alternator.

Cheer , Flarboy.

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Re: BSA A10 Alternator primary chain cases.
« Reply #14 on: 06.07. 2012 19:58 »
You say tomaytoe I say tomartoe. I've always called them generators. Saying dynamo to most non-pommie bike riders is met with a wtf is that.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
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Muskys Plunger A7