Do you have to change the oil filter every time you add new oil on a suzuki gsxr?
No you only change the filter when you change the oil.
How do you stop suzuki gsxr 1998 750 fuel injection blowing no 1 cylinder this will be fourth engine?
No, not just bolt on and go, get the rear spacer from the gsxr wheel and install rear wheel with that spacer and remove te stock one that's on the Busa, then mill .125 off the rear brake caliper hanger so it tightens to the wheel.. as for the front you'll need the gsxr 1000 rotors too, as well as spacers from the gsxr for them to fit a Busa.
There's no such thing as a 'Suzuki Ninja' 'Ninja' is the trademarked name of a series of Kawasaki's sport bikes, Suzuki's sport bikes trademarked name is 'GSXR' e.g. A Kawasaki ZX-10R would be similar to a Suzuki GSXR-1000, there are a lot of different things on each bike but a lot of Suzuki and Kawasaki parts are interchangeable on various bikes.