hey guys i have a serious problem on my hands with the cub 71,,,,,,the standard rebuild kit for a k-161 is measured at 2.9 something,,,,well my engine cylinder measures at about 2.875,,,,,if any of you guys have any information about this special thing please let me know asap,,,,,also the engine was never torn down, and it had a stock steel govenor gear,,,,,is this normal?,,,,,charlie anybody please help,,,,,,,