Don't change the springs in the carbs. Again, do not change your pop off. You need everything as per stock settings, from low and high speed needle adjustments to pop off psi. If it is within range leave it alone. Range is pretty wide, so if your within it, and both carbs are pretty close to each other 1-3 psi then you are good to go.
-Use your finger to cover up carb fuel exit pipe. I was suggesting you get a pop off tester because it is also used to test and see if carb needle and seat is stuck open due to lever being bent ever so slightly and keeping needle out of seat at idle allowing fuel to enter carb throat. Needle is supposed to be seated in seat at idle.
-This was my problem and caused bogging, hard start, rich condition. I diagnosed it by starting ski up with air filters and everything removed. Letting ski idle and real quick looking down each carb throat with mirror and flashlight....MAG carb was dribbling fuel into throat causing engine to run very rich thus culprit of my problems. I took carb off, and before dis-assembly I performed the psi hold test I mentioned in your other threads. Put finger on fuel exit pipe of carb, pop off tester hose on fuel inlet...pump up to 10 psi, and it needs to hold that for 30 secs. I actually pump it up higher to 20 psi and make it hold for longer as I am adamant about verifying the needle is seated. Sure enough mine was bleeding down, and you can see bubbles around needle and seat area while doing this proving that air is leaking past seat, ( use wd40 to lubricate the whole area, bubbles will arise from it ) and that shows why it was dribbling. I adjusted my lever arm. Retested. Reassembled, and retested multiple times. Now ski has never run better.
FYI: A small tip: If you ask all of these questions in 1 thread it will be much easier for everyone to chip in and know what you have already done and not done. Starting a new thread for every single question will create lots of back and forth questions from guys who know your answer, but haven't seen your other threads.
Rob
