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Dave Martin
Dave Martin
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Identifying an A75 Lightning engine
#784561 09/17/19 8:55 am
Joined: Sep 2019
Posts: 1
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Hi all, this is my first post on this site so bear with me if I err in any way.

Yesterday i became the owner of a BSA A65 Lightning (Clubman?)- in er, 'kit form'.

The basic details are that it is supposed to be a 'Clubman', but only has a single carb. (To be honest, while it would be nice if it was a Clubman, I wouldn't be overly concerned if it wasn't)

Engine number is: AS65DC 7144 and is supposed to have been in use for some years by the factory before being registered for road use.

Is their any obvious way of identifying whether it is standard or clubman without a strip down?

Incidentally the cylinder base appears to have been welded up (bottom left hand side) at some time.

Any suggestions would be most welcome.....

While I'm in 'begging mode', any suggestions as to the best source for information, other than this site (obviously...) on doing this project please? (I'm anticipating about 2 1/2 years to completion- (same as for my Velocette Venom))

Thank you,
Dave (er, Knackered @75)

Last edited by [email protected]; 09/17/19 8:57 am.
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Re: Identifying an A75 Lightning engine
[email protected] #784562 09/17/19 9:44 am
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The dispatch records are the best way to prove or disprove it being a Clubman. The DC engine code was used on any twin carb 650 road model with a CR gearbox in 64/65.

You will have to count gear teeth to verify if it still has CR gears.

The footrests and foot controls were unique to the Clubman. Are they still on the bike? If not, someone was making the various parts. I have some drawings to make the parts if needed.

Here is my replica Clubman

[url=https://postimages.org/][Linked Image from i.postimg.cc]


Never underestimate the human ability to elevate stupid to a whole new level!.
Re: Identifying an A75 Lightning engine
[email protected] #784569 09/17/19 11:13 am
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First off, welcome to the asylum, Dave.

It's good to see that Rich has responded. He's the resident Lightning Clubman guru.

I'll second the point about the dispatch records. According to Google Maps (so it must be true), Stafford is only about an hour's ride from the VMCC library in Burton on Trent. That's apparently available to non-members, and they have almost the full set of BSA dispatch records on microfiche. The BSA Club also has a copy of the records, but I'm not sure what the availability is like.

Both the BSA Club and VMCC will provide a dating certificate for a fee as well, if you can't manage to check the "books" yourself.

The story about it having been a factory hack is intriguing. That should show up in the dispatch records, though they do require a certain amount of effort to interpret.

Re: Identifying an A75 Lightning engine
[email protected] #784570 09/17/19 11:21 am
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A75 engine code normally refers to the triples, wasnt used for twins.
The title "Identifying A75 Lightning " will not help future searches.


71 Devimead, John Hill, John Holmes A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: Identifying an A75 Lightning engine
gavin eisler #784604 09/17/19 5:49 pm
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Quote
Engine number is: AS65DC 7144


... AS65 ?

Re: Identifying an A75 Lightning engine
[email protected] #784632 09/17/19 11:04 pm
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If it'll do 60mph in first then it's got a close box.

Re: Identifying an A75 Lightning engine
[email protected] #784802 09/19/19 9:49 pm
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With clubman gearing and gearbox it should do 10mph for every 1000rpm. So 7000rpm would be 70mph. Etc.

Clubmans and all Lightning’s from that period would have small ports and valves - 68-466

The good news is, if the rearsets and clubmans seat are set up right then it’s such a comfortable ride, more so with the CR box.

If you have the original exhaust... keep it. Have it rechromed or what ever it needs as all the reproductions available don’t come close in quality or performance.


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (undergoing restoration)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)

Re: Identifying an A75 Lightning engine
gavin eisler #784930 09/21/19 6:30 am
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Originally Posted by gavin eisler
A75 engine code normally refers to the triples, wasnt used for twins.
The title "Identifying A75 Lightning " will not help future searches.

650 twins were designated as A65, 750 twins were A70, triples A75


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