Dominator vs Commando final drive sprockets

Dominator final drive chain is listed as 5/8 X 1/4 (pre-'66) in my books, later and Commando as 5/8 X 3/8
 
Is it for clearance reasons? I find this perplexing because they both use the same chain ( 530).


The first one is listed on the Slimline page and the last one for a Commando.


andover-norton.co.uk

Motorcycle parts and spares for Norton motorbikes - Genuine Andover Norton Spare Parts - Andover Norton Motorcycles Parts - Original Andover Norton Parts

Motorcycle parts and spares for Andover Norton motorbikes: Andover Norton manufactures and supplies all Genuine Factory Spare Parts for Norton motorcycles built before 2002.
andover-norton.co.uk

andover-norton.co.uk

Motorcycle parts and spares for Norton motorbikes - Genuine Andover Norton Spare Parts - Andover Norton Motorcycles Parts - Original Andover Norton Parts

Motorcycle parts and spares for Andover Norton motorbikes: Andover Norton manufactures and supplies all Genuine Factory Spare Parts for Norton motorcycles built before 2002.
andover-norton.co.uk
 
I have old catalogues from RGM and N*rvil.... Both used to list 1/4" and 3/8" chains though RGM's website no longer lists the former...
(but Andover do :) )
 
Last edited:
EstuaryBoy said:
I have old catalogues from RGM and N*rvil.... Both used to list 1/4" and 3/8" chains though RGM's website no longer lists the former...
(but Andover do :) )
Click to expand...
Pretty certain, based on owning '62 and '64 slimline dommies, Norton used the 1/4 chain until '64 and then changed for '65. I think in '64 they added the key lock to the top yoke and then in '65 went to 3/8 chain. "Incremental development." However, probably because the company (AMC) was in financial distress, specific component changeover dates are probably pretty meaningless.
 
The rear drum did not look to have any different teeth size than commando so I would guess it is already 3/8.

What about instead of increasing the size of the gearbox sprocket, increase the size of the engine sprocket. I see they come also in 20-21T range?

Wouldn’t that give a similar gearing up effect while being a little easier to change out?
 
I am surprised nobody has said anything about changing the engine sprocket for a larger one. I think stock is 19t.

It was easier and therefore was probably done more often than changing the gearbox sprocket back when the bikes were new.
 
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