Your carbs need more thorough cleaning. Outlined above.
Many great mechanics. Who can remove engine in less than 15-minutes. Who can rebuilt engines in less than day. Have had to remove their carbs 4-5x for ever deeper cleaning before their bikes ran great. I suggest you do it 1st time around. Well, 2nd time now.
Here's some photos of what's involved. Need to scrub out all hidden secret passages in carb-body.
https://www.ninjette.org/forums/show...87#post1267487
Some related threads:
https://www.ninjette.org/forums/showthread.php?t=330960
https://www.ninjette.org/forums/showthread.php?t=322846
https://www.ninjette.org/forums/showthread.php?t=321223
https://www.ninjette.org/forums/showthread.php?t=317977
https://www.ninjette.org/forums/showthread.php?t=317810
https://www.ninjette.org/forums/showthread.php?t=316395
https://www.ninjette.org/forums/showthread.php?t=315193
And shortcut to get your bike running like factory-fresh off showroom floor in case you don't want to buy all equipment needed (scrub-brushes, ultrasonic cleaner and micro soda-blaster). Or spend decades learning how to restore carbs back to factory-fresh clean condition:
https://www.ninjette.org/forums/showthread.php?t=226815