Husqvarna 359 bogs with throttle on start.

[J D]

Wouldn't be the first time a bit of varnish or gunk has been cleared by running a few tanks of fresh fuel through the carb.
I think the exhaust bolts are high tensile or something similar to accommodate the temperature variation... might find your hardware store bolts aren't the best option long term

 

[Gord404]

Kinda funny- muffler bolts for 372-390 etc are 3$ a piece from the dealer last time I bought them- found an automotive store that sell grade 8 bolts for 11 cent a piece- buy them by the 100 lot- usually bend the insert hole so they cant get lost when in and put the muffler back on and usually hit the inside of the muffler with air pionted away from me so I dont get it in the face to make sure there is no loose carbon of whatever before putting the muffler back on.

 

[stihltech]

UMM, I must respectfully disagree on the muffler not needed. At least on a stock saw. Have cured more that a few in the same way.