First off, I don't know much at all about chainsaws other than I can start my Poulan WildThing pretty easy and know how to swap/adjust the chain. I feel confident using it to drop small trees and buck medium thickness logs. I'm planning on putting an aftermarket chain on it and interpreted a comment here to mean I also need to put a new bar on it to match the chain...? is that right? I think I'm getting an Oregon Chain replacement chain and will get a bar too if I need that. Also, can I switch to a 16" chain/bar if mine currently has an 18"? I saw some coments here thatsuggested 16" was just easier to handle unless you have large logs. I try to use small tomedium logs so a 16" might be better for me (and easier to keep the tip out of the dirt). Thanks!