How many 750s models were produced?

If the INOA Tech Digest suggests that Commando s models engine numbers fall between 131257 and 135088, does that mean there were 3,831 s versions made? (mine falls within that range thankfully!) Is there anyway to know how many yellow ones were made like mine? Kem

kempoyner said:

If the INOA Tech Digest suggests that Commando s models engine numbers fall between 131257 and 135088, does that mean there were 3,831 s versions made?

Click to expand...

No, as there would also be Fastbacks and 750 R models and probably some early Roadsters within that serial number range.

kempoyner said:

Is there anyway to know how many yellow ones were made like mine?

Click to expand...

The VMCC holds the surviving factory records but it is unlikely they could give you that information.
http://www.vmcc.net/

The VMCC holds the surviving factory records

Click to expand...

No, not all of the surviving records. We (Andover Norton) have some originals that were never in the posession of the Science Museum and were also never put on microfilms- whicvh is what the VMCC no have. Still incomplete, though- there are (I hope) some more originals somewhere out there.

ZFD said:

The VMCC holds the surviving factory records

Click to expand...

No, not all of the surviving records. We (Andover Norton) have some originals that were never in the posession of the Science Museum and were also never put on microfilms- whicvh is what the VMCC no have. Still incomplete, though- there are (I hope) some more originals somewhere out there.

Click to expand...

Then I shall rephrase my answer to: I believe the VMCC holds the surviving records for the 750S production period. :roll: As you had stated previously that the AN ledgers only cover the "late 750/850 era".

Has AN offered to share their records with the VMCC or NOC?

Kem, would you care to share your S number and manufacture date with me? I have a list of nearly 20 S or possible S types from this forum. Mine is 132031, APR 69 and I'm sure it came from the factory as a FireFlake Blue S.

Dave
69S

Dave,I want to thank you for being so helpful with information and advise! I really am finding it very useful. You posted a picture awhile back of two dogleg mounting brackets for the high exhaust. I only ordered one...do I need two? My numbers are 134966 date is Dec. 1969. It was sold as a 1970. I will be posting pictures soon of the bike. It is amazing how it cleaned up. I was able to get the original front fender from the original owner. I rebuilt carbs and replaced all cables and hoses except the top oilers. They are metal and were in great shape. so other than that and new "S" exaust, the bike is 100% original and looks almost new. The tank and side covers are incredible! The color poped back and they shine like a new helmet! Wish they were not fiberglass. The throttle and choke controls snap back in place with authority! When it comes time to fire it up, my buddy is bring me aviation fuel. I really think this could be one of the finest examples of an original 1970 yellow "S" existing. Being in arizona covered up for over 25 years and only having 11,000 miles on it.....Im a lucky guy!

My frame, engine and trans all have this number:135524 and bike is registered as a 1970. But on the engine the serial number looks like this: 20M3S/135524.

What does the 20M3S mean?

sole survivor said:

My frame, engine and trans all have this number:135524 and bike is registered as a 1970. But on the engine the serial number looks like this: 20M3S/135524.

What does the 20M3S mean?

Click to expand...

The model code used for the early Commandos with the points housing behind the cylinders was "20M3" (20 = Atlas, M3 = Mk3) . This was normally stamped as a prefix to the engine number.

When the 750S was introduced with camshaft driven points assembly, the code used for those models became "20M3S". Subsequently the 20M3S prefix was applied to all models when they changed to camshaft driven points (Fastback & R) and when new models were introduced, the code continued to be used until the end of 1971 production.

L.A.B. said:

sole survivor said:

My frame, engine and trans all have this number:135524 and bike is registered as a 1970. But on the engine the serial number looks like this: 20M3S/135524.

What does the 20M3S mean?

Click to expand...

The model code used for the early Commandos with the points housing behind the cylinders was "20M3" (20 = Atlas, M3 = Mk3) . This was normally stamped as a prefix to the engine number.

When the 750S was introduced with camshaft driven points assembly, the code used for those models became "20M3S". Subsequently the 20M3S prefix was applied to all models when they changed to camshaft driven points (Fastback & R) and when new models were introduced, the code continued to be used until the end of 1971 production.

Click to expand...

Cool. Such a good answer even if it has been asked a 1000 times already. I have been enjoying making upgrades and riding I never thought to ask that question until I saw this thread. Thanks a bunch. I feel smarter than I did five minutes ago.

Doug

Kem,

Thanks for the number. Only one dog leg bracket. The two I was showing was a comparison of the RGM and original. The original is a bit beefier, so I had my local welder add some bracing to the RGM one and used it. There is also a bracket on the silencer side of that bracket, hardly ever seen in the pictures. The silencer bracket (dog leg?) is 061314 and the stay is 061307, it may be one of those.



I made one up from a piece of stainless that was a bit thicker than the original steel one that was well beat up.

You're lucky to get the original front mudguard, I hope you got the stays with it, nothing else fits.

Keep an eye on those metal lines, they will eventually crack and leak.

If you've got the original bearings and pistons, be careful with it and don't over rev it. The pistons are prone to come apart and the drive side bearing really needs replacement with a 'superblend' roller.

If you want to slog through my rebuild, just look up '69 Phoenix rises' and there's many pages in there.

You may find the carbs don't hold an idle very good, they wear pretty fast, mine at 13K were not nice, I got anodized slides which helped, but I should have gotten them sleeved or new premiere carbs. The Pazon Sure or the Altaire works good on the 750 for a reasonable price, but you have to get new coils, so if you don't mind non-original look, get the Power Arc from Old Britts that includes everything for not much more.

Pictures would be real nice. BTW mine was registered as a 70 also, even from April.

I'd be interested to know what jets are in your carbs too.

Dave
69S

Oh, when you mount the exhaust, make sure you block the headers away from the primary while tightening the exhaust rings and also push the silencers onto the headers as far as you can. It makes for a more stable situation.

Dave
69S