Hi Mark,
I have a 450 that my neighbor gifted me earlier this year before he moved. It’s missing the muffler (it only has the base assembly, part number 52424A). Do you have any of the top assembly parts (53205B) and screws (110371) available? Additionally, the primer (carb model 61853A) is very leaky. Do you have any rebuilt units that would fit? The saw has great compression, and I managed to get it running last summer, but the airbox fills with gas through the primer.
Thanks!