Yes, you're going to want new mains and pilots, larger sizes than stock, but the needles and needle jets usually don't need replacing. That's a good thing because you can't get genuine ones anymore, only knock-offs. Be aware that these BS34 carbs use different types of mains and pilots than the BS38's you were working on. The mains are the large round style, Mikuni part #N100/604 .....
..... and the pilots are the BS30/96 type .....
One size up on the pilots should be good (#45) but the mains will depend on your mods. One size up (to a #135) might do for only one mod like the pods, but more than that will most likely require more sizes up. If you plan the usual "pods and pipes" modding, I'd skip right over the 135 and get 137.5 and 140.
You haven't quite disassembled everything. I see your pilot circuit air jets are still in the bell mouths. That's OK, they just flow air to the pilot circuit and rarely get dirty or plugged. You can blow through them to insure they're clear with them still in place. But, they are another tuning factor for your idle circuit. You can change them. Usually, you reduce their size by a couple. This lets less air in and makes the idle circuit richer. They don't have as big an effect as changing the pilot jet size so can be considered a "fine" tuning adjustment.
I also see the metal plugs are still in place covering your mix screws. Personally, I feel they need to come out so you can access the mix screws. The tiny o-ring on the mix screw usually needs replacing by now, not to mention the screws are set very lean from the factory. The removal process involves drilling a 1/8" hole into the plug and threading a sheet metal screw into it. Then you grab the screw with vicegrips, twist and pull the plug out. The tricky part is not to drill too deep, not all the way through the plug. The mix screw is just below it and made of soft brass. Drill through and you often damage the screwdriver slot on top of the screw. To further ward off damage to the screw, it's a good idea to grind the sharp point off the sheet metal screw .....
You'll notice a tiny hole in the center of the plug. Use this to judge your hole depth. The plug is about 3/16" to 1/4" thick. Drill a little bit and check the hole. Look at the size of that tiny hole in the center of the plug. Drill a little more and check it again. Keep doing this, drilling just a little at a time, until you see the tiny hole in the center of the plug begin to get larger. Stop drilling any further, you're almost through the plug.
