Well, it is a hassle to remove a slide to look at your jet needle with the carbs on the bike. You can remove the four carb tops. Remove the keeper plate located between 1&2 carbs by removing the 5mm phillips head screw. Take out the two end rubber caps. Then remove the five 5mm hex head bolts. Now you can slide the throttle rod over one way or the other so you can pull out two slides at a time without pulling the rod all the way out. Once you get a slide out, remove the 3mm phillips head screws that hold the slide to the slide actuator using a VERY GOOD #2 phillips screwdriver.
You can remove one of the outside bowls using a short phillips head screwdriver. You will need a very small flat blade screwdriver to pull out the pilot jet and just use an 8mm socket to remove the main jet holder which will have the main jet on it.
Like I said, doing this with the carb off the bike is about a zillion times easier. Your carbs are fairly early VM24 w/pilot air screws. I suspct they will have #102 mains, #15 pilots and 5DL31-4 jet needles but I could be wrong since there are a BUNCH of variations; plus somebody could have modified the jetting over the years.