Any chance I can get a measurement or drill bit size of your modded 5020 muffler? I already run 40:1 with quality dirt bike oil and ethanol free fuel. I dont mind going to 32:1 at all.
The mfr recommended 50:1 and I just dont believe in that ratio at all. I have killed far too many coated dirt bike cylinders at 50:1 even using the best of the best Castor or synthetics. I am fairly certain the Craftsman 50cc engine uses a steel sleeve and is not coated like the 5020, so I debated on using 32:1 from the start, but I thought it may clog the spark arrester screen (if it has one?) If it doesnt cause a problem going 32:1 I will gladly up the oil in my fuel.
I will switch to a 16 bar later with a full chisel bit chain, but for now this bar is new and so is the chain. A good tune and bar/chain combo is the key for sure. I have spent many hours on a big Stihl with a short bar and chisel bit chain, it really helped me get through some long days but a cheap saw tuned and setup well can get the job done also. I no longer have the Stihl or my 16 inch Craftsman, just this 20 incher Craftsman Pro I picked up last week. One of my buddies was cutting side by side with me all day with some cheap saw he picked up, and me using my Stihl MS 361 and he did just fine with his. I think he picked up my 361 and immediately set it down and said no thanks. He is a tad bit smaller than I am. I am definitely one to use whatever works, regardless of the name.