-
Yup b screw been messed with = gears no worky very well.
From memory that is the right 9s slx. It'll be written on it exactly what it is
Pic of how the inner is clamped in the rear mech.
Check the cable means park it in 1st, click it down a few then pull outer cable from the frame stops and slide it ban and forth, make sure no kinks and it's very smooth with little friction. Then put it back in the frame stops.
BrickMan-
I’m not being mean, but giving the chain and cassette a good clean wouldn’t hurt. And this is going to sound like a stupid question, but now many sprockets are there on the cassette? It’s kind of hard to count them with the muck. :D
I only ask because I had somebody come it the shop with ‘crap’ shifting after they replaced their cassette themselves, 10spd Tiagra for ‘a cheap one of the net’ or as I pointed out a 9spd Sora one. Oops!
Chaley
Maybe it's the picture but it looks like the pulley is miles away from the cassette. Adjust the B screw if so