I just bought a little chonda from the tip yesterday - Wesco 16 inch (no catcher yet). All of about 5 years old and in near perfect condition (clean oil, filter, near new blades).
Adjusted the valves, choke and cleaned the rust out of the carby, and it went first go.

As a side note, I know a couple of people who have never had issues with the chonda's (beside choke), and they all use 95 or 98 octane petrol. And then I see that Sanli recommend a minimum of 95 octane fuel.

I emailed Sanli last month, and they said 'Our manufacturer has determined that 95 octane is the best fuel to use on our machines after decades of manufacturing these engines and continually testing them.'
I guess that decades involves sitting and waiting for Honda's design patents to expire laugh

Maybe the added injector cleaner in 95 ron gives a bit more chance of avoiding the rusty carby issue.