I fucked about tried cleaning my low mile originals 3 times with they've only done 10,000 miles !
Tried 4 other sets until I got some that worked perfectly,I found out its not just jets there's a few tiny orafaces inside that clog too.
The jets also get yellow/green gunge inside them you cannot easily clean or even get to,the best option is to buy new emulsion tubes, jets etc & replace the rubber parts too.
My low mileage set needs about £80 or so spent to make them good,we've got the EU & the shitty petrol they sell to thank !
Those tiny orifices are the transfer ports. If you look at the carbs on the airbox side you see two air jets. The one on the left is the pilot air jet
At idle air is drawn through that jet down a small orifice and it goes into the holes in the side of the pilot jet and out the narrow end of the jet.
That draws fuel up from the bowl at the slotted end of the pilot jet and up through the center of the jet and the air fuel mixture goes down another orifice and comes out of the small holes on the engine side of the butterfly valve called transfer ports. The transfer port orifice is joined to the the mixture screw orifice so the air fuel mixture also comes out at the mixture screw hole. Turning the screw in blocks the hole and turning it out lets more fuel through.
That's how the idle circuit works and all of the passages have to be clear not just the jets.
There's a good diagram of what I'm saying. The left side is the airbox side