Sharpen that god damn chain man. And if the saw has been sitting for years, go thru it and tighten up al the screws on it and use gobs of blue loctite or similar especially the exhaust. Any of my 051s would much that bit of wood in short order. Its not that big really but good to see an old 051 running. Its looks like an 80s model to me. Side fill oil tank, bigger fuel tank etc etc