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Atlas frame VIN numbers

Norton Models (not Commando or P11)

Atlas frame VIN numbers

Postby Hortons Norton » Thu Jan 26, 2017 8:40 pm

Just picked up a new project, a 1968 Atlas. Where do I find the stamped vin frame number?? They may be painted over and I just can't see them. The bike was purchased from someone that was starting to gather the parts to turn it into a triton and I'm going to build it back to a stock Atlas. Also I picked up some cases with the numbers 20/113750 /P does anyone know what year these are?? Really looking forward to this build, Although I know very little about the Atlas. It's missing lots of bits but it looks like there are lots of parts out there. Thanks in advance for any help, Chuck.
1975 Commando MKIII
1972 Combat
1998 Buell S1
1998 Buell S1W
2005 Triumph Thruxton
1968 Atlas project
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Re: Atlas frame VIN numbers

Postby triumph2 » Fri Jan 27, 2017 12:56 am

Frame number will be on the left side frame gusset just above the swinging arm spindle. Engine number is approx mid '65.
'73 Norton Commando 850
'69 Norton Mercury 650
'65 Norton Atlas 750
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Re: Atlas frame VIN numbers

Postby norton bob » Fri Jan 27, 2017 2:19 am

The P stands for Plumstead AMC factory.

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Re: Atlas frame VIN numbers

Postby gtsun » Fri Jan 27, 2017 7:02 am

Wow HH, can't wait to see the results. I am really wanting to build up a featherbed twin also.
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Re: Atlas frame VIN numbers

Postby Bernhard » Fri Jan 27, 2017 7:51 am

triumph2 wrote:Frame number will be on the left side frame gusset just above the swinging arm spindle. Engine number is approx mid '65.


+1
As long as you have all the chassis number you can trace it, i.e. is there any hole drilled for rearset footrests :?:

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Re: Atlas frame VIN numbers

Postby Hortons Norton » Sat Jan 28, 2017 9:55 am

Thanks guys for your information, The frame looks to be in good shape as far as all the tabs go. I did notice a crack near the front motor mount that will need to be welded and were the side stand was the frame is crushed in a bit. it looks great shape other than that. I'll look for the frame number today and do some more cleaning also. maybe post some pics, Thanks again guys.
1975 Commando MKIII
1972 Combat
1998 Buell S1
1998 Buell S1W
2005 Triumph Thruxton
1968 Atlas project
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Re: Atlas frame VIN numbers

Postby grandpaul » Sat Jan 28, 2017 12:14 pm

Numbers will be in the format of the top two-digit number being the model (Atlas = 20), then the serial numbers stamped one digit below the other vertically.

i.e.

20

3
3
1
2
5
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Re: Atlas frame VIN numbers

Postby Hortons Norton » Sat Jan 28, 2017 7:14 pm

Found it guys, thanks.
1975 Commando MKIII
1972 Combat
1998 Buell S1
1998 Buell S1W
2005 Triumph Thruxton
1968 Atlas project
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Re: Atlas frame VIN numbers

Postby BillT » Sun Jan 29, 2017 6:27 pm

If it is a 1968 model year-produced Atlas, the frame number would be somewhere between around 124300 and 126145. Most of the 1968 production after this number were Commandos.

If the number is earlier, it is actually a 1967 model year bike.

Here in the US, bikes were often titled in the year they were sold, rather than the model year the factory produced them.

Atlas bikes produced after 121000 (mid-year 1967) would have a distributor and Amal concentric carbs. Bikes built before then would have a magneto and monoblocs.
'73 Norton 850 Commando - 3030xx
'69 Norton Ranger 750 - P11/1289xx
'67 Matchless G15CS - G15CS/1235xx
'61 Matchless G80CS - 61/G80CS/41xx
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Re: Atlas frame VIN numbers

Postby johnod » Sun Jan 29, 2017 7:07 pm

Where can I find info to decipher my own frame numbers?

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Re: Atlas frame VIN numbers

Postby texasSlick » Sun Jan 29, 2017 8:13 pm

johnod wrote:Where can I find info to decipher my own frame numbers?


http://www.classicbike.biz/Norton/Maint ... umbers.htm
1963 Atlas (Original Owner)

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Re: Atlas frame VIN numbers

Postby johnod » Mon Jan 30, 2017 2:35 pm

Thanks.

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Re: Atlas frame VIN numbers

Postby wot » Sat Feb 11, 2017 3:04 pm

Wow, that's pretty close. Your motor is 20/113750/P and I have motor 20/113800/P sitting in my latest project. I don’t remember much about this motor other than it’s been in my shop for at least 35 years. It's missing carbs and manifolds, and missing the mag too, but that doesn't matter because I'll be using more modern stuff. Turns over and seems o.k.

Gonna make a café racer with it.

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