I was pleased with 28mm carbs, On my ex L/ning rep', I thought I would be flat out all the time, But not so,
I can still do 80 mph on 1/4 throttle, My other Bike has 36 mm Dellortos, So I am used to big carb's,
I now have 30mm on the l/ning, Mk2 Amal, But that was what came up for sale.
It's more about the state of tune of the Engine , Mine is 9 to ones, Mk2 cams, Open Armours, Exhaust.
Cheers Bill.
P.S. The spares Company Manifolds, Rubber type stub fitting, Are only about 29 mm, A bit thin to take out much more.