AlfA01
ArboristSite Guru
Nice saw!
I'm 3 tanks into my 6421 converted to 7910. I am happy with the power output. New p/c had 145psi cold compression, after the first tank it was 185 psi cold. I haven't ran it next to my 390xp but from my initial thoughts, I think that they are in the same ballpark.
That's good to hear. If you even think its close to the same ballpark with the 390, then its doing awesome. I was just looking at mine and thinking I should check the compression yesterday. I knew by sometimes forgetting the deco that it has gotten up there compared to when the P&C were new.