Intake Manifold #544082301
My 445 Husky, purchased in July 2012 and used quite a bit cutting firewood, started to idle rough, did some stalling and was hard to keep running and carb adjustments were needed but did not hold. I saw a YouTube video that illustrated the problem- and air leak somewhere in or around the intake manifold. I replaced it with the part #544082301 and installed a gasket kit in the carb. This saw has been run on nothing but non-ethanol and Amsoil Sabre (90 to1). Upon installation of these parts the saw is back to normal and runs as new.
IF you install these parts it is not hard but tedious and you need to have a clean, well lit work area and do not hurry it. You will also see where leaks can occur. Make sure the four allen screws are cross and evenly tightened when secured to the motor. Sometimes I felt like a dentist working in someone's mouth while doing all this. But it worked.