Norton Commando 750 - Model

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paulkgilbert

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Nov 10, 2015
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Sorry to keep on but just purchased this. I believe this is a 1971 fastback, the VIN is 140096 and I think the engine number is 24237 does that look correct? I know that if it is a 1970 there maybe a frame issue I need to correct, it is on the back side of the right cylinder (sitting on bike), on the left side it has 20M3/140096. I think the front disc is an upgrade?

Many thanks for the help Paul
 

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paulkgilbert said:
Sorry to keep on but just purchased this. I believe this is a 1971 fastback, the VIN is 140096
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Although it may be titled as a 1971 model "140096" falls within what can be considered the 1970 series specification.

http://www.bmh.com.au/norton/index.php?id=modelnum


paulkgilbert said:
and I think the engine number is 24237 does that look correct?
Click to expand...

No. (see 24237 below)

paulkgilbert said:
I know that if it is a 1970 there maybe a frame issue I need to correct
Click to expand...

No. [Edit: Only the very first Commandos up to serial 128634 had the weak frame]

paulkgilbert said:
, it is on the back side of the right cylinder (sitting on bike),
Click to expand...

I presume you mean "24237" which is just the cylinder barrel casting number (not the actual part number) it isn't a serial number.

paulkgilbert said:
on the left side it has 20M3/140096.
Click to expand...

That is the engine number but are you sure it isn't 20M3S/140096 ?

paulkgilbert said:
I think the front disc is an upgrade?
Click to expand...

Correct. It would have had a drum brake, originally,
http://www.classicbike.biz/Norton/Broch ... Norton.pdf

One safety issue I noticed is the rear brake cable incorrectly routed under the Z-plate.
This should be re-routed as shown, below.
Norton Commando 750 - Model
 
Excellent, so no frame issue to correct and I will change the brake cabling. Yes it is 20M3S/140096 so that is the engine number?

thanks
 
Looks like a well set up bike.
The front disc brake looks really good with the new master cylinder and hose.
The oil filter behind the cylinders was a nice period accessory.
Nice alloy wheels look good too!
 
Yes it is 20M3S/140096 so that is the engine number?
Click to expand...

Yes it is the factory engine number, maybe someone else took the other number as an engine number, that happened to my bike where the wrong frame number was taken and it has had to stay that way.
 
140096 would also have been stamped on the upper lug of the original gearbox casing.

paulkgilbert said:
if it is a 1970 then is it a MK I or MK II
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Fastback Mk II (from 139571 with upswept "peashooter" exhaust system). A relatively short-lived model only made for around 3 months before being replaced by the 750 Mk III series (from 141783).
 
The disc is std Norton, the caliper looks like a Grimcea

Norton Commando 750 - Model


mounted on an adapter plate.
 
Yes, I'd agree with 1970 hardware. It has the bolted up rear hub, not the later cush drive version, as well as the smaller frame mounted center stand. A '71 would have the cush drive hub and center stand mounted to the engine cradle. Headlight ears and, from what little I can see in the pictures, the triple clamps also look like the earlier style.
Nice clean ride!

B
 
Hi,
1971 do not has the large oil tank and the side cover with the fastner on the battery tray.
Very nice bike, do not warry for the year.
Ciao
Piero
 
The bike looks nice and with that center stand it couldn't be later than 70.
I noticed that it has 850 exhaust nuts, they don't go as far in as the 750 style due to the way the 850 pipes are with the cross over. Make sure the pipes are tight and not just the nuts or you may be talking to Jim.

John Ebert
Texas
 
paulkgilbert said:
John

Can you point out the nuts/bolts I need to replace and I will.

Thanks
Click to expand...

I believe that John is refering to the large fin exhaust roses.
Become more familiar with this topic before you do anything.
It is not that common to know that 1973 750 length exhaust roses have big fins which some universally (incorrectly) recognize as 850 (short thread) exhaust nuts.
You may not necessarily have a problem....
If I misread the thread than please disregard.
 
dynodave said:
paulkgilbert said:
John

Can you point out the nuts/bolts I need to replace and I will.

Thanks
Click to expand...

I believe that John is refering to the large fin exhaust roses.
Become more familiar with this topic before you do anything.
It is not that common to know that 1973 750 length exhaust roses have big fins which some universally (incorrectly) recognize as 850 (short thread) exhaust nuts.
You may not necessarily have a problem....
If I misread the thread than please disregard.
Click to expand...
Dave, yes I was referring to the exhaust roses. I have never personally seen the big finned 750 ones. Looking at the picture it looks as if the roses were up against the head, that is why I mentioned it.
John Ebert
Texas
 
My 72 has a 152 engine no.

Your fuel tank is most likely made from Fibreglass, modern fuels will rot the tank from the inside out, unless the tank has been lined with an ethanol proof liner. Some of the earlier liners such as the original Petseal are not proof against Ethanol.

Worth checking if the tank has been lined, if it hasn't remove fuel and review your options.

Charles
 
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