my neighbor just gave me a'85 snapper. 21" comm. grade,self prop.,4hp. b.s.engine. i changed the oil,filter and plug and it fired up after a few pulls!no smoke at all! i cleaned it up and it looks pretty good for its age.tranny and everything works good. whats it worth?thanks. oh, the j.d. above has a6.75 b.s. engine.