A little heat from gas torche will soften-up red Loctite. Then use impact-screwdriver with hammer to remove.
One cable pulls throttle open. Other cable pulls throttle closed. Are you missing right-hand electronic controls cover which contain cable guides? Be sure to lube cables before assembling. Video here:
https://www.ninjette.org/forums/showthread.php?t=222352
Bent bar with rust underneath may snap when you bend it back. What I do after it breaks off is square up end with grinder, clean up mating surfaces and weld back on. In some easier cases, it’ll only crack 1/2-way around. So I’ll clean up crack really well and braze it over for smooth finish.
Of course you’ll find lots of posts where people increase jet size and get better performance, but that’s because they didn’t fully clean their carbs and larger jets just compensate for clogged dirty carbs. Improved performance (back to stock power) won’t last long as dirty carbs will continue to accumulate varnish and continue clogging further and further.
You can actually pick up quite a lot of power by leaning out main jets 2-3 sizes on factory-fresh clean carbs. Factory jetting is pig rich and fouls plugs horribly if you spend any significant amount of time at WOT.