I recently purchased a Kangke Monocoupe 90 and I am trying to decide what I want to power it with. I am down to 2 engines , the Magnum .91 fs and the Irvine .72 2 stroke. I am leaning towards the Irvine ( really like Irvines). It seems that most people are going with 4 strokes in this plane. Should I forget about the 2 stroke and go 4 stroke? Do I need the added weight up front that a four stroke offers?