Hayabusa Gearbox - the fixed model

[fasterfaster]

Max the picture indeed does tell the story as looking at the mark across the top of the locator pin I'd say it hasn't been aligned with the bearing on assembly and when cases have been tightened it's pushed it thru the casting. Rotational force would tend to tear the casing with the pin not drive it downward. The pin also not locating the bearing would allow excess sideways movement of the gear and hence the result as the bearing has moved outward resulting in excess play which has then allowed the gear to hammer at the circlip. You could probably use a pin punch to tap the pin back out Max and then it looks like there is enough room to carefully fine drill casing boss underneath the locator and put a small roll pin in underneath to prevent it being able to move down out of place. Should be a few good second hand shafts kicking around at the right price ?