As discussed before my RE plugs are very sooty.
120/38 jets VD83 carbs venting to atmosphere.
Float heights all good, choke circuits all good and operating in sync. Valve guides do not appear oily and bike uses little oil. Idle mixture adjustments make no difference. Bike runs throughout rev range with no problems.
Any suggestions on what I might try next?
Do you know if the needles have circlip type or the normal “flat-top” type.?? Do they have any shims underneath their heads…??
If the idle mixture screws make no difference, the fuel must be getting in through somewhere else. If I screw my mixture screws in too far, the engine will stall. 2 to 2-1/2 turns out is the stock setting.
Smithy.
Needles are held in by a nylon lock piece - no circlip. No shims on needles. Idle mixture adjustments do change engine revs but leaning mixture does not stop the sooty plugs. Idle mixture set to get best idle.
Needles have a 1H5 stamped on them.