I have a honda gx 160 they came off of a trash pump . it's a great engine fires right up nicely but the problem is that the drive shaft is slightly bigger than a 3 quarter inch clutch will take . it's almost like it's a millimeter bigger than 3 quarters of an inch. the clutch simply will not fit and it's definitely not a 1 inch drive shaft so what gives? . anybody had this experience before? Thank you