Is my 2006 Gsxr 600 port fuel injected or direct injected? I think most bikes are port.

Hello. I have a 2003 Gsxr600. The first issue I had would happen around the 4500-6000 rpm range. When trying to roll on the throttle the bike would struggle to accelerate and be really jerky. Adding Injector cleaner and lubricant would help after forcing the bike to accelerate past 6000rpm a few...