Chainsaw problems muffler gets red hot

You are running it too lean and running too hard. doubt if it will last anytime at all before the piston freezes up. Dont forget to mix oil with the gas at the proper mixture, take to the saw shop and have them adjust it as I see you don't have it adjusted properly. The high and low jets need adjusting. Turn the high speed jet counterclockwise until it starts to cackle when it is running at top speed. Then when idling give it full throttle for an instant. Does it instantly have power or does it go blah. If it goes blah and does not engage quickly with power then turn the low speed jet on the carburetor to the left as you keep trying this. Only turn it a fraction at a time like say 1/8 of a turn at a time then try it again. Once you have full power when you engage the throttle, I mean it has to be instant then turn the low speed 1/8 turn more. Recheck the high speed jet by giving throttle for full speed. Do not let it scream, you must adjust the high speed jet til it starts to cackle. That way it stays in control and will not scream unless you are in wood cutting under a load. By the way the low speed jet should also be adjusted to give you more power when you are cutting as you first hit the throttle and not bog down. Do not get confused with the chain stopping and hung up so it wont turn, I am talking about the engine and it powering the chain when it is free to move in the wood when cutting. Anyhow don't run your saw to the point of a red muffler. If you want to use your saw again. It's not good!