where i live the average tree can be milled with a short bar. my question is can i put a 18" bar on my 066M without affecting performance and safety.:greenchainsaw:
Casey is right. Put a 24" minimum, which will allow you to mill about 19-20" wide boards. I used a 36" bar with a 36" mill since I had it at first. I too often came up on logs that were too wide for the mill. I went to a 42" to get all available 36" on the mill. I still use the 36" bar more often, but wouldn't consider anything smaller than a 24" and a 30" may be a better move yet.
It's not like you don't have the power to drive it.