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Commando

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A technical forum for Commandos

No Engine numbers What could have happened.

Submitted by stephen_whybrow on Tue, 26/01/2021
Forums
Commando

Hi

I am restoring my 1971 Commando 750

The previous owner had this bike for over 20years and bought it for somebody in the Midlands.

The bike if registered with the DVLA but there seems to be some lost years.

It was despatched to Corbetts of New Cross in SE London in September 1971

Now here is the strange thing.

The bike has no engine number and its first registration for my V5 says first reg 1990 It does have the compliance plate still attached.

Does anybody know why it does not have an engine number.

Norton Commando Colours 1971 Fastback

Submitted by stephen_whybrow on Tue, 26/01/2021
Forums
Commando

Hi All

I have a Norton Commando Fastback 1971 at the moment it is painted red with black side covers.

I want to repaint to the factory colour of Fireflake blue.

Did 1971 Fastbacks have black side covers or are they the same colour as the tank.

I have look all over and cannot find any evidence of the fastback. Roadsters and Interstates seemed to be matching.

Any info would be great

Many thanks

Stephen

Gearbox Camplate Spindle Bush

Submitted by andrew_mackenzie on Sat, 23/01/2021
Forums
Commando

I have had to get a new gearbox shell for the Mk3 because the known bearing housing crack and an oval top mounting bolt bore.  The new casing came from A-N via Norman White.  I have just fitted the two shaft bearings and was preparing to install the camplate and quadrant. The casing came with the two spindle bushes pre-installed, so it appeared to be a straightforward assembly task.

Rear wheel offset

Submitted by ernie_olivo on Fri, 22/01/2021
Forums
Commando

Hi from the colonies,

I’ve just replaced the old rear rim on my ‘71, going from WM2/19 to WM3/18. I’ve got it laced properly, BUT, Bacon lists the original offset at 3/16”(4.8mm), and he says the dimension will be altered by1/2 the difference in width of the rear rims. The WM3 measures 8mm wider than the WM2, suggesting an offset change of 4mm. If that at all makes sense, the offset for the WM3should be barely 1mm. Am I on track, or has isolation and Covid scrambled my brain?

Valve guides and valve seat cutting

Submitted by marcus_brown on Fri, 22/01/2021
Forums
Commando

I have just replaced the valve guides on my 850 mk2a with colsibro guides, these were supplied  pre machined, ie the bore could not be reamed and honed to a desired clearance with the stem. The head guide bores though were good, no ovality or scoring and were good for a 1thou+ interference fit so was happy with that.

But after fitting I checked the new valve stem to bore clearance it was 3 thou, this seems a tad too much but Ive no spec on the clearance but I would have thought 2 thou on the exhaust and slightly less for the inlet.

Bap Filling?

Submitted by alec_stevens on Tue, 19/01/2021
Forums
Commando

Have about 6 pairs of these kicking around in various states of "usability" , What I have run out of is the internal plastic pipe to create a reserve. Two points, can you get the plastic pipes anywhere and, second, would they be ethanol  proof these days? The last one I removed was a pitiful shrunken thing.  BAPs are still better than anything else so its worth trying,   Thanks

Oil return line

Submitted by ian_taylor2 on Tue, 19/01/2021
Forums
Commando

Would somone be kind enough to explaine to me how the returning oil from the pump is in part diverted to become chain lubricant ? What regulates the flow?  Thanks Ian

Engine Numbers

Submitted by pip_mcqueen on Sun, 17/01/2021
Forums
Commando

I have a Commando which I need to register with the DVLA for a V5 and age related plate. I contacted the club for information about the engine and frame number and it seems the engine number is documented as an 850, the barrels have the base nuts showing which I assumed made it a 750. The numbers are stamped into un molested casting not showing any signs of tampering. Can anyone shed any light on what may have happened, is it possible 750 barrels are fitted on the 850 crankcase?

 

Pip McQueen

Stanchion v.s. Fork slider

Submitted by jerry_lyon on Wed, 13/01/2021
Forums
Commando

Hello Forum

In Jan 2021, I purchased a pair of stanchions and sliders from Andover Norton for my 73 Norton Commando.

Upon assembly, I'm finding that the stanchion bushing will not pass into the opening at the top of the slider.  Any advice appreciated.  Thank you

Jerry

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