G'day,
i would assume that 1972 is more to the point because the Briggs and Stratton engines that superseded the old Tecumseh engines on the Scott Bonner model 45 were pre electronic ignition (introduced in 1982). Also i have a HK30 engine on a 45 and know it was earlier then my old 1980 Briggs on another Scott Bonner 45.
hope i haven't confused you further!
regards jay
