Have you taken your meds today? Talk about pure nonsence. Where the fork did Dolmar enter the picture here? I said NOTHING ABOUT THE Dolamr 5100... where in your little mind did this shyte come from? I trashed the Echo, but for completely different reasons.
Pay attention now: this applies to Stihl saws, and the 290 (also applies to the 250). Look at the average used Stihl .325 bars for sale on Ebay. They are mosly all devoid of bar paint. Pay attention now... that is becasue they pinch in the cut. Why? Becasue .325 has a wide kerf. I have tested this many times in the field, with a 290 and a 250 (larger and smaller format .325 bars, same type of Stihl chain). The .325 cuts wander, the bars pinch, the paint comes off with use. Simple. Has zero to do with cutting technique, or skill, or ability, or anything else. Now look at the 3/8 picco or standard Stihl saw bars. Most of the paint is still on there. The wear patterns are completely different. They cut straighter.
Its really that simple. You all want to go crazy in response to these simple observations, fine. Say what you want. Scream all you want. As for Dolmar, since YOU are the one that brought it up, I could never find a 5100 for sale here on any shelves. Zero availability means zero chance of my ever owning one. But that has zero to do with this topic of discussion here. Why does running a .325 on a Dolmar have anything to do with running one on a 290? Different bars, different chain, and different saw.