I more often than not replace the lines and the filter as well. Especially if the machine has lived near the ocean (one tip over here is about 1km from the ocean and the suburbs near it are the same or closer).
The cooling fins are usually corroded, and the accompaniment of a pitted die cast filter and sludge.
The internal gauze was ruined on that Homelite - simply not cleanable. I seem to recall some of the Zama's (C1U-H49 from memory - the one without a choke plate) have those super fine gauze filters.
they are very strong metal as well - hard to remove, harder to check for cleanliness.
