I bought the Hatori 824 pipe and 828 header for my OS 200FS (not the EFI version which is probably the problem) and the header does not fit. The threads that screw into the exhaust port needs to be at least 11mm with the gasket fitted to fully tighten the header but it is only 8! Does that mean the 200FS has a much deeper exhaust port than the 200 EFI?