Ok, I'm not an expert on much but definately not chainsaws. I just have a basic Poulan my wife got me for fathers day about 8 years ago and it does what I ask of it. When it dies I'll get something better. The fact that I need pliers just to get the gas and oil caps on and off because the plastic threads look fine but for whatever reason are impossible to turn drives me a little nuts. But anyway, here's my question. I think it's 16" but need to measure it so not sure. I saw a post the other day where someone was talking about swapping bars on a saw (16" - 20") and I see how easy the bar and chain come off my saw. Can you change the bar as needed for a bigger one or is the engine set up to have what it came with? Not looking to overload it or anything, just curious.