What brand clocks are these?

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Mk2a, Nov 73 build, no welch plugs, std side plates with long screw and grease nipple, long spindle and long bushes. Later the MK2a got the welch plugs, felt inserts, short spindle and bushes etc but no cotter pins.
That's my setup. No welch plugs and long spindle and bushes. Just replaced it.
 
What is your swingarm like, does it have Welch plugs?

And a front to back or side to side battery tray?

If no plugs and front to back, sounds like a front end crash repair to me.
No plugs and battery mounted in the length. Why does that sound like a repair? What exactly is repaired then?
 
December '73 would, I think, be too early to have the sealed (welch plug) pivot assembly.

The battery tray in line with the frame would be correct for a Mk2 as it's a US model and not a European Mk2A.

As mentioned previously the Mk3 hinged seat and seat lock suggests it has a Mk3 frame as the brackets to attach the hinge and lock are not fitted to the Mk2/2A frame although some late Mk2/2A models had a Mk3 frame (without the hinged seat) it would be about a year on from December '73.
Edit: Also, it's not difficult to transfer the headstock certification plate from one frame to another so the date stamp isn't absolute proof of date of manufacture.
 
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Besides any legal requirement to have a metric speedometer there was all manner of oddities going on in that period.

My 1973 (early to mid) 750 GT is a Amal concentric bike with INOX guards and Veglia instruments, later in 1973 they got Dellorto 30 mm PHF's.
In 1974 they got Smiths instruments.
Moto Guzzi 850''s were little different having 29 mm VHB Dellorto's but had had Amal concentric's.

British motorcycles with Italian instruments, Italian bikes with British carburetors and or instrument's.

Perhaps a case also of available supply and or who might extend credit the longest. (besides traffic legislation/legalities)

(My Dec 73 Mk2a is as Kommando's and non Welch plug)
 
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Are there besides seat lock any other differences between MK2 and MK3 frames?

I don't know the differences between MK2 and MK2a (is there an MK2b?).
 
Are there besides seat lock any other differences between MK2 and MK3 frames?

Look for a 6-digit number stamp on the front face of the LH fuel tank mounting bracket. This is the (850) frame part number.
The early 850 frame part number is 064140
Later pre-Mk3 frame is 065404
Mk3 frame is 065632.

What brand clocks are these?




A Mk3 frame has two 06.5620 brackets. One is the left-hand side outer shock mounting plate (for seat hinge attachment) and the other is the right-hand side inner shock mounting plate (for the seat lock).
Also:
LH inner is 06.6102.
Steering lock plate 06.5422 although Andover Norton also supplies this as a replacement for the pre-Mk3 frame steering lock.

https://andover-norton.co.uk/en/shop-drawing/462/1971-on-commando-frame-repair-items

A pre-Mk3 frame would normally have either four 06.0412 plates...

...or two 06.0412 outer plates and two 06.4282 inner plates.
https://andover-norton.co.uk/en/shop-details/20497/frame-r-susp-mount-plate

I don't know the differences between MK2 and MK2a
The main differences are that the Mk2 (the US model) had the metal perforated airbox, peashooter, or Interstate silencers/mufflers, battery in line with the frame, LH side panel secured to the frame at the front by a metal Dzus fastener and previous style kickstart lever.

The Mk2A (European low noise model and also a limited number of Mk1As) had the black plastic airbox, 'black cap'/'bean can' silencers (often replaced with peashooters), battery positioned across the frame (due to the larger size airbox) LH side panel secured by a plastic Dzus fastener at the lower rear of the panel and kickstart lever angled to clear the black cap silencers.

Some Mk2As were also sold in the US in late '74.

(is there an MK2b?).

No.
 
Thanks, that's very nice info. I have the metal airbox en metal Dzus fastener. I will take a look for the numbers, Hope I can read them as the frame is powder coated. I sanded some parts around bolts and nuts for a good ground connexion. Everything on this bike is MK2 I know it came from New York, but the hinged seat tells other wise. I'm curious what the numbers will tell.
 
I'm curious what the numbers will tell.

There's usually a 'frame' number stamped directly onto the headstock on the RH side adjacent to (not on) the certification plate.

The number if found, should also give an indication of the frame's approximate date of manufacture.
 
There should be a month/year date stamp on the frame gusset plate behind the LH Z-plate in the area identified, below?
Frame.jpg

Pic courtesy @L.A.B.
 
Numbers are all the same: 3117**. Frame stamped and plate and engine. Gearbox has no number, I guess it's been replaced, at least the case.
 
Numbers are all the same: 3117**. Frame stamped and plate and engine. Gearbox has no number, I guess it's been replaced, at least the case.

Are you saying the steering head is stamped with the 3117** number like the pic I posted up the page ?
 
We are still taking clocks (gages in US)? So my MK III has Smith gages Are they correct or replacements. British bikes drive me nuts with their use of "existing supplies".What brand clocks are these?
 

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So my MK III has Smith gages Are they correct or replacements.

I can't read the number on the speedo but it looks correct, therefore, should be marked SSM 4003/00 1000
Rev counter RSM 3003/21 is correct.
 
To see what frame you have then you had best post a pic of the frame stamp and of the part number stamped on the on the front face of the LH fuel tank mounting bracket. That will confirm which 850 frame you have and possibly the origin of the frame stamp.
 
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