G'day all,
It looks like johnando has posted a full set of Briggs 'magic numbers' there. I.e Model 80202 Type 0607-02 Code 7704150
So BB has given the manufacture date, and the Model No. says that it has a Pulsa-Jet carby.
But as BB says, we really do need some close-up pics of the carby area, as there are several linkage variations for that carby type, and this is the most likely problem area.