TORS means throttle override system. They are supposed to
a failsafe against your carb slides sticking open.
The TORS will keep your engine from building up any rpms.
Unplug the wires going to them.
As far as your pilot jets go...if you have your air screws almost
fully seated on the stock 25's, you need to put larger ones in there
and set your air screws to about 1.5 turns out. Put the 27.5's in
there and do that and seee how it runs.
Sounds more to me like a jetting problem. Mine used to be hard
to start untill i got the jetting right.
Its a trial and error process, man.