A full carburetor cleaning and rebuilding is in your immediate future, if you've never done a carb cleaning, for in for a real learning experience. If the pilots look really bad, it's easier just to buy new ones, than possibly wasting time cleaning them, between the actual jet size, and tubes it's not a lot, as shown in the photos below.
Install a fuel filter also .
BACK-UP PLAN:
https://www.ninjette.org/forums/showthread.php?t=210752