Hi,
I have BS34s on a Canadian 83’ XS650.
The carbs are stock jetted 132.5/42.5, float height set to 22mm, 5HX12 fixed clip needle, with mix screws turned out 3 1/2 turns.
Stock ignition.
The problem is,
Before I let the bike sit for 6 months, it ran with nicely tanned spark plugs at 2 3/4...