Parts are super easy to get once you figure out the 4500, 5200, 5800 and 6200 chinese saws share most everything parts wise.
Most of the 6200's are 54.6 cc, most of the 5800 are also 54.6 cc, the smaller ones are pretty close to what they claim and use a shorter stroke crank. I avoid the 4500 and 5200, they're the same weight as the bigger cc versions with less power.
I've been running different versions of this saw for years. The joncutter 5800, is solid and the supmix6200 runs good but has crap plastics. Im in canada so I get different versions than you do, the supmix is the best cheap one here.
The pinkway 63cc saw is solid too, they gave a bunch to youtubers to test and they're alright, it's the same 54.6cc saw.