Because you are getting oil smoke, the PCV problem sounds more likely than fuel starvation - it would explain everything with just one fault (though on ex-tip mowers, multiple faults are not unlikely). If the PCV port or drain is blocked there should be oil in the breather tube - otherwise there shouldn't. You should also be able to see it in the air cleaner below where the breather tube connects. Both types of blockage are fairly common on chondas. I think part of the reason is that nobody seems to ever change the oil on them, so things sludge up. Also, some of them have flap-valve PCV instead of disk valve, and I suspect the flaps are unreliable, but I haven't looked into it.
I've outlined how to check the PCV system here:
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=63423#Post63423If you have any questions, please post them in this thread.
