Ok Guys...I need some feed-back...

I've been in a quandry on what engine to use. I would like to go gas powered, and considering a ZDZ 140. I've read that the engine will weigh in at 2.8 lbs. ready to fly...is this to much engine/weight for this model. This is the lightest gas motor I've found so far. Any idea's or comments ?

Soft landings always,
Bobby of Maui