My concerns with the stock carb is all that extra junk on top of it(Mines taped too). But my main concern is the pre set pilot..
Do I have to buy a throttle cable if i want to use a 26mm oko carb?
Where did you get the idea of a pre-set pilot ? As to your carb, sounds like either the carb body is stripped or the TORS cap is.
You get a TORS elimination kit, comes with cable, cap, drill, tap.
Use Blaster TORS elimination cable with the OKO carb. Make sure it has the correct slide cutaway, slides are pricey if you have to change them for tuning.
As to your pipe, while it looks cobbled together, it may work on, you won't know until you try it.
FYI on the OKO carbs. When they first came out they were the hot ticket, especially for Banshee's. Then quality fell and there were issues with chrome plating peeling off the slides and issue with fuel inlet circuit, leastwise when used on Banshees.