The diaphragm can be attacked by ethanol & perish--is it intact? You would soon know as petrol would enter the oil system & oil pressure would drop.
You can get ethanol proof ones now.
I had problems getting a good idle and I eventually made new gaskets for the stubs that the solexes mount onto the head,using hylomar on all joints and surgically rebuilding my carbs.
I cant fully recall but the float needle valves may be worn /sticky. I got new rebuild kits from gower & lee.
Note the only level setting is by means of varying the packing washers under the Needle Valve and as Geoff says the 16mm is critical.
I also found that a leaking water pump meant erratic firing on front cylinders,and I had 2 duff plugs as well.
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