Britbike forum

Classic British SparesKlempf British PartsBaxter CycleBritBike Sponsor SteadfastCyclesThe Bonneville ShopLowbrow CustomsGirling Classic MotorcycleLucas Classic MotorcycleHepolite PistonsIndustrial tec supply

Upgrade Your membership! Premium Membership Gold Membership Vendor Membership

New Sponsor post
2023 Classic Triumph Motorcycle Calendars
by C.B.S - 09/22/22 5:28 pm
New FAQ post
Member Spotlight
Trenton, New Jersey
Posts: 1,248
Joined: February 2007
Comment Guidelines: Do post respectful and insightful comments. Don't flame, hate, spam.
Top Posters(30 Days)
kevin 117
Top Likes Received (30 Days)
kevin 29
reverb 29
Newest Members
Abtinnmant150, Fritzer_108, Ratty, paul cheswick, White Lightning
12,260 Registered Users
Who's Online Now
2 members (breeze1954, Gordon Gray), 12 guests, and 26 robots.
Key: Admin, Global Mod, Mod
Forum Statistics
Most Online204
Jul 10th, 2022
Thread Like Summary
Allan G, Gary E, JER.Hill, Jon W. Whitley, KevRasen, kommando, leon bee, NickL, pushrod tom, Ray Elliott, Shane in Oz
Total Likes: 22
Original Post (Thread Starter)
#871905 02/12/2022 11:41 PM
by Bustednukel
Found matched cases stamped A65LC. Guessed the C meant Competition which made me want to know more. Found out here at BritBike on the Serial Number pages that it means Clubman. Were A65 Lightning Clubmans only produced for one year? The left case has a casting number 70-0999 The case has the trans and cam.
More questions:
1) The serial number script varies. Bogus?
2) The casting number on the left case is 70-099. Bogus confirmed?

[Linked Image from]

[Linked Image from]
Liked Replies
#872614 Feb 20th a 11:20 PM
by NickL
Different views and takes on this stuff by various people but iv'e always
thought that what made any of these old crates rare or different was
what tuners and blokes did with the standard factory turned out mostly
junk of the day, not what bloody number was stamped on the cases.
All the cases were the same over all the models anyway, it's not as if
the spitfire had special strengthened features or the lightning clubman
had facility for fuel injection, they were the same as the others with the
exception of the head and/or gearbox cluster, maybe a set of pistons
and carbs. All the stuff was available for anyone to bolt on if they wanted.
3 members like this
#871910 Feb 13th a 12:18 AM
by Ray Elliott
Ray Elliott
The C indicates 1969 model year. For that year BSA used a new typeface for stamping all engines (as well as all Triumph triple engines as they were made at Small Heath). And serial #s were on the raised pad as on your cases though the pad did change a couple of times during the 1970 model production.

Oddly they didn't use the same typeface on frames as far as I can recall.

This looks like a replacement crankcase (the 70-9099 is legit as is the serial # pad). When I worked in the Brit bike business (in Texas USA) the area service manager would bring stamps & stamp replacement cases with new #s. This looks like the case here as a few are not correct: 5,6, 8 & possibly A. The others look correct. Maybe whoever stamped it lost part of the set & used others. Then it may have come off the line this way. The 5,6, & 8 may have been lost or swapped for a beer.

Frankly, I'd take it as a novelty & not worry about it.

As an aside I have read in several places that BSA stamped completed engines then later stamped frames to match. Maybe. In the video Bits Stuck Anywhere there is a clip of the Triple assembly line. One worker is stamping the engine #s at the end of the line. Perhaps he was trying to correct a badly stamped #. I have seen one serial number with a 4 stamped over with a 1 to match the frame.

When T160s were on the market I had to replace a few crankcases. The last time I saw the SM he came to stamp some replacement cases. He left his stamps at the shop. Only a few days later NVT announced liquidation & I never saw the fellow again. Over the years I lost most of the set. I can stamp any serial # as long as it uses B, L, T, 1, 2, 0 only.
2 members like this
#871909 Feb 13th a 12:14 AM
by Rich B
Rich B
A65LC are early 1969 serial number.

Lightning Clubman were A65DC - 1964/1965
2 members like this
#871951 Feb 13th a 12:43 PM
by Rich B
Rich B
There are a number of serial number lists that claim Lightning Clubman’s were built in 1966 and used the A65LC engine code. I have researched that model a lot, IMO any bikes dispatched in the 66 model year as Lightning Clubman’s were left over bikes.

There were 190 Lightning Clubman’s built in 64/65 using A65DC engine code. Allegedly, 29 more were assembled in 66 model year. Note that A65DC does not clearly define a Lightning Clubman. Any road model dual carb 650 twin of 64/65 model years with a close ratio gearbox got that engine code. The close ratio gear set was available in 66 and those engines would have been stamped LC. The odd Spitfire Hornet cases from 64/65 show up stamped EC as well.
2 members like this
#871978 Feb 13th a 05:45 PM
by Gary E
Gary E
I believe those number stampings could very well be original factory work.

I have a fairly large collection of engine number stamping images from multiple years. All manner of letter and number fonts were used at the factory and in different combinations. Here is a sample of an "8" being of a different font than the rest.

[Linked Image from]
2 members like this
#871989 Feb 13th a 08:19 PM
by Irish Swede
Irish Swede
I'm with you, Gary.

We see this in the Triumph numbers, too.An example is the larger letter "S" in 1964-66 Triumph "TR6SR" lead-in to the serial numbers.

There need be NO rhyme or reason in how the factories stamped serial numbers, just so long as they are consistent from bike-to-bike in any model year.
2 members like this
#871907 Feb 12th a 11:59 PM
by NickL
Suspect numbers there........ later cases but who cares.
If you don't like the number, just stamp another one.
1 member likes this
#872092 Feb 15th a 02:09 AM
by Ray Elliott
Ray Elliott
Ok, I've been convinced to set aside my adult beverage, go to the garage to investigate. I have A65s from 67~72 as well as many frames & crankcases. I do have a complete '69 whose provenance I know. That one is A65TCnnnnn. It uses the old stamps as do other '69 crankcases.

The old stamps used a larger 8 as a rule, so the OP's #s may be 100% legitimate.

The A65x/MYnnnnnn scheme was introduced in 1970 as far as I can tell. All '69s are A65xCnnnnn.
Of course this brings us to '70 where it may be A65x/MYnnnnn or a '67 serial # with -Y.

Then in '71 some where MYnnnnnA65x OR A65x/MYnnnnn.

I think that I'll go back to my AB before I think about this more.
1 member likes this
#872115 Feb 15th a 09:59 AM
by BrizzoBrit
Had a look through my collection of images

I had a particular interest in 1969 year stamps at one stage. My early 69 A65F has some different fonts to that. But sits about 3000 down the number series and the order of the individual elements has changed to the later style format with the letters indicating month & year and the model last. Bacon's books state numbering system changed during 1969. I know he gets things wrong but mine is consistent with that.

I found 2 others with the A65LC XXXXX format. Some similarities noted. Interestingly these all sit in the 11xxx number range. Looks like its anything goes on the stamp fonts. That 8 looks consistent though.

I'd say my bike has genuine numbers. The others look OK to me.

Attached Images
1 member likes this
#872076 Feb 14th a 10:40 PM
by NickL
From a purely practical point of view, the later the cases. the better they are.
Like most motors that have been in production for several years, various
developments are included into the later ones and certainly with the A65,
there were several improvements and the strengthening of the cases generally.
If the machine is going to be used as a motorbike rather than an exhibit, then
the latest cases were better.
1 member likes this
#871943 Feb 13th a 09:59 AM
by Allan G
Allan G
Those are early 69 cases before they introduced the month/year number system which was around at least November time, the machines finish with the BSA background stamp came later in 69.

Interestingly I have a later set of cases (1970 on) with similar stamping. I assumed they were replacement cases but seeing this, perhaps not.

They may have been some LC cases in 66, though the C would always have meant close ratio and not clubman.
1 member likes this
#872210 Feb 16th a 02:43 PM
by Gary E
Gary E
>"...I believe spitfire (maybe only mk2/3??) engines had the little piled arms stamp near the number, just like the one on the GP carbs. Though I don’t know if they did this on clubman motors. AIUI it was something that was done to signify motors being assembled in the competition shop. Maybe Gary could confirm?"

That little stamp was typical on multiple models. I know of no information to indicate it was anything special.

[Linked Image from]
1 member likes this
#872158 Feb 15th a 09:01 PM
by Allan G
Allan G
Originally Posted by Shane in Oz
Originally Posted by Allan G
They may have been some LC cases in 66, though the C would always have meant close ratio and clubman.
I think the 'C' was intended to indicate the close ratio gear cluster. The Lightning Clubman would have come with the CR gear cluster, so being stamped LC may just be a happy coincidence.

I’ve actually Amended my text to “not clubman”(I should proof read before clicking post)

A bit like the DC casings, all clubmans (least from 65) had DC motors, but not all DC motors went into Lightning clubmans.

Bikes with close ratio boxes could be ordered (or at least in theory) right until the end, however whether the factory continued to stamp the engines accordingly is beyond me.

I believe spitfire (maybe only mk2/3??) engines had the little piled arms stamp near the number, just like the one on the GP carbs. Though I don’t know if they did this on clubman motors. AIUI it was something that was done to signify motors being assembled in the competition shop. Maybe Gary could confirm?
1 member likes this
#872296 Feb 17th a 09:10 AM
by kommando
Originally Posted by NickL
Originally Posted by kommando
The casting surface is as original behind the stamps, so regardless of when it was stamped ie at the factory or at a dealer the current numbers are the first numbers stamped. So very extremely unlikely to have be parted out from a stolen bike and then restamped.

After filing the area flat, use some coarse emery and hammer it onto the surface,
you wouldn't be able to tell the difference between that and the original finish.
You may have to scrub the area with dirty kero and wire brush etc.
Then just stamp whatever number you want, don't be too neat as the factory wasn't
and don't hold the stamps too square or it'll look too good.
OR just run a weld across the number and say the case was cracked.
If it was a Brough i may worry but these things were mass produced like sausages,
who cares?

Yes but I was not going to mention that wink . Plus it does need some skill and technique to do it properly or it just looks too uniform.
1 member likes this
#872699 Feb 22nd a 04:12 AM
by BSA_WM20
There were a lot of duff engines
Down here a BSA stamp under the engine number was a service replacement engine or an engine that had a warranty service done
1 member likes this
British Cycle SupplyMorries PlaceKlempf British PartsBSA Unit SinglesPodtronicVintage MagazineBritBike SponsorBritish Tools & FastenersBritBike Sponsor

© 1996-2022
Powered by UBB.threads™ PHP Forum Software 7.7.5