date and code info log splitter motor

need help id this engine b&s mod 190402 type 0696-01 code 728021 went to pages that explain numbers didnt get it,thanks for your time Dave Don:confused2:

It is a 8 hp horizontal, rope start, updraft carb, with a date of manufacture of August 2, 1972

thank you!she's an oldy,i was in h.s.that year,it came to me with a 110 ac starter so that would have been added by p.o.she sure vibrates ,so much that the adj screw has to be played with every 10 min or so.and it has to catch itself sometimes like the float is reacting.i stretched spring it helped little,also is there a gear thats available on a 12 volt thats[ 18 tooth?]so i can re-use the 110 volt ring gear ?thanks