Ive this model saw its 61.5 cc I was under impression that I could fit the 72cc jug n cylinder from another stihl without to much BS any stihl folks here that know the process the saw was/is old, free and runs just fine. 72 cc saws are in the 500 plus range the 72cc parts on a 034 would be approx. 200 bux I don't care about not being able to run the 04 HD filter the flocked unit is just fine I get a lot of orig Stihl stuff free