i have a sprocket adapter,and marked on it in pen it says zx10 but it dont fit on my 07 zx10 engine.
the adapter has 12 teeth and my engine output shaft has 13 teeth
can anyone confirm if there is 2 types perhaps older or newer zx10's

There are two types I'm afraid...

Steve

There are 2 adapters. I found out when the kind people at MK sent me the wrong one (twice)