I tried posting this earlier and don't see it. If it is out there and I missed it I apologize. 1972 Homelite T-16 H with a 16hp Briggs. It backfires and I can't get it to stop. It starts and runs. Has new points,cond etc.. Has new head gasket, plug. It is on a hydro trans and is a pain to get in and out of tractor. This was my dads from day one when he sold them. I can't figure it out anyhelp would be greatly appreciated. I am working on three diff. tractors at one time to keep sane. Thanks for looking.