It took a couple tanks for the carburetor to settle in I think. I’ve done 3 jobs with it and the first two were rough, but this last one it was finally cooking like it should. I have the 28” bar and I think that’s all you wanna do. 24” is probably the sweet spot. If you want bigger bar do the Stihl or husq 90 CC. Highly recommend replacing chain with Stihl yellow.